Apple iMac 24'' Retina MJV93D/A All-In-One-PC with macOS

  • All-In-One-PC, macOS 64 Bit
  • 61.0 cm (24.0") Display, 4480 x 2520
  • Apple M1 (8c) 8x
  • M1 GPU (7c) Shared Memory
  • 8 GB RAM, 256 GB SSD
  • Wi-Fi 6 (802.11ax), 2x Thunderbolt 3
  • incl. Magic Mouse 2, Magic Keyboard

Apple Mac Studio MQH73D/A (Mid 2023) mini-PC-PC with macOS

  • mini-PC-PC, macOS 64 Bit
  • Apple M2 Max (12c) 12x 2.40 GHz
  • M2 Max GPU (30c) Shared Memory
  • 32 GB RAM, 512 GB SSD
  • Wi-Fi 6E (802.11ax), 4x Thunderbolt 4, 2x USB 3.1 Gen2 Typ C, 2x USB 3.1 Gen2

Apple Mac mini (Early 2023) MMFJ3D/A mini-PC-PC with macOS

  • mini-PC-PC, macOS 64 Bit
  • Apple M2 (8c) 8x 2.40 GHz
  • M2 GPU (10c) Shared Memory
  • 8 GB RAM, 256 GB SSD
  • Wi-Fi 6E (802.11ax), 2x Thunderbolt 4, 2x USB 3.1 Gen1

Lenovo Legion T5 26IAB7 i9-12900F 32GB/1TB SSD RTX3070 Win11

  • Intel® Core™ i9-12900F Prozessor (bis zu 5,60 GHz), Hexadeca-Core
  • 32 GB RAM, 1 TB SSD, USB 3.0
  • NVIDIA GeForce RTX 3070 Grafik (8192 MB), HDMI, DisplayPort
  • Formfaktor: Tower, WLAN, BT, Giga LAN
  • Windows 11 Home 64 Bit

Lenovo IdeaCentre Mini 01IRH8 i5-13420H 8GB/256GB SSD UHD ohne Betriebssystem

  • Intel® Core™ i5-13420H Prozessor (bis zu 4,60 GHz), Octa-Core
  • 8 GB RAM, 256 GB SSD, USB 3.0
  • Intel UHD Grafik, HDMI, DisplayPort, Thunderbolt 4
  • Formfaktor: Ultra-klein, WLAN, BT, 2.5Gb LAN
  • ohne Betriebssystem

Captiva Highend Gaming I73-925 Tower-PC with Windows 11 Home

  • Tower-PC, Windows 11 Home 64 Bit
  • Intel Core™ i9-13900KF 24x 2.20 GHz
  • NVIDIA® GeForce RTX™ 4070 12.0 GB
  • Ada Lovelace Architektur, mit Raytracing und DLSS 3
  • 64 GB RAM, 2 TB SSD
  • 3x USB 3.1 Gen1 Typ C, 2x USB 3.1 Gen2, 6x USB 3.1 Gen1

Apple Mac mini (Early 2023) MMFJ3D/A-Z16K003 mini-PC-PC with macOS

  • mini-PC-PC, macOS 64 Bit
  • Apple M2 (8c) 8x 2.40 GHz
  • M2 GPU (10c)
  • 8 GB RAM, 256 GB SSD
  • Wi-Fi 6E (802.11ax), 2x Thunderbolt 4, 2x USB 3.1 Gen1

Lenovo IdeaCentre Mini 01IRH8 i5-13500H 16B/1TB SSD Iris XE ohne Betriebssystem

  • Intel® Core™ i5-13500H Prozessor (bis zu 4,70 GHz), Deca-Core
  • 16 GB RAM, 1 TB SSD, USB 3.0
  • Intel Iris Xe Graphics Grafik, HDMI, DisplayPort, Thunderbolt 4
  • Formfaktor: Ultra-klein, WLAN, BT, 2.5Gb LAN
  • ohne Betriebssystem

HP Pavilion 27" QHD IPS All-in-One R7-5700U 16GB/1TB SSD Win11 27-ca0401ng

  • AMD Ryzen 7 5700U Prozessor (bis zu 4,30 GHz), Octa-Core
  • 16 GB RAM, 1 TB SSD, USB 3.0
  • AMD Radeon Grafik, HDMI
  • 68,6 cm (27'') QHD All-in-One PC, Webcam, WLAN, BT, Gb LAN
  • Windows 11 Home 64 Bit

Apple Mac Studio MQH73D/A-Z17Z002 (Mid 2023) mini-PC-PC with macOS

  • mini-PC-PC, macOS 64 Bit
  • Apple M2 Max (12c) 12x 2.40 GHz
  • M2 Max GPU (30c) Shared Memory
  • 32 GB RAM, 1 TB SSD
  • Wi-Fi 6E (802.11ax), 4x Thunderbolt 4, 2x USB 3.1 Gen2 Typ C, 2x USB 3.1 Gen2

MSI MAG Infinite S3 14NUC5-1669AT i5-14400F 16GB/1TB SSD RTX4060 Win11

  • Intel® Core™ i5-14400F Prozessor (bis zu 4,70 GHz), Deca-Core
  • 16 GB RAM, 1 TB SSD, USB 3.0
  • NVIDIA GeForce RTX 4060 Grafik (8 GB), DisplayPort
  • Formfaktor: Desktop, WLAN, BT, 2.5Gb LAN
  • Windows 11 Home 64 Bit

Apple Mac Pro 3,5/32/512 GB SSD 8 GB 2xRadeon Pro W6900X BTO

  • Prozessor: 3,5 GHz Octa-Core Intel Xeon W Prozessor
  • Arbeitsspeicher: 32 GB DDR 4 ECC - 2666 RAM
  • Speicher: 512 GB SSD
  • Grafik: 2x Radeon Pro W6900X mit 2x 32 GB GDDR 6 Grafikspeicher
  • Betriebssystem: macOS Catalina

Lenovo Legion T5 26IAB7 i7-12700F 32GB/1TB SSD + 1TB HDD RTX3070 Win11

  • Intel® Core™ i7-12700F Prozessor (bis zu 4,80 GHz), Dodeca-Core
  • 32 GB RAM, 2 TB Speicher, USB 3.0
  • NVIDIA GeForce RTX 3070 Grafik (8192 MB), HDMI, DisplayPort
  • Formfaktor: Tower, WLAN, BT, Giga LAN
  • Windows 11 Home 64 Bit

Lenovo IdeaCentre 3 07IRB8 i5-14400 16GB/1TB SSD Win11 90VT0051GE

  • Intel® Core™ i5-14400 Prozessor (bis zu 4,70 GHz), Deca-Core
  • 16 GB RAM, 1 TB SSD, USB 3.0
  • Intel UHD 730 Grafik, HDMI
  • Formfaktor: Tower, WLAN, BT, Gb LAN
  • Windows 11 Home 64 Bit

Apple Mac mini (Early 2023) MNH73D/A mini-PC-PC with macOS

  • mini-PC-PC, macOS 64 Bit
  • Apple M2 Pro (10c) 10x 2.40 GHz
  • M2 Pro GPU (16c) Shared Memory
  • 16 GB RAM, 512 GB SSD
  • Wi-Fi 6E (802.11ax), 4x Thunderbolt 4, 2x USB 3.1 Gen1

Captiva Ultimate Gaming I75-161 i9-13900KF 64GB/2TB SSD RTX 4090 Win11

  • Intel® Core™ i9-13900KF Prozessor (bis zu 5,80 GHz), Tetracosa-Core
  • 64 GB RAM, 2 TB SSD, USB 3.0
  • NVIDIA GeForce RTX 4090 Grafik (24 GB), HDMI, DisplayPort
  • Formfaktor: Tower, Gb LAN
  • Windows 11 Home 64 Bit

Victus by HP 15L Gaming R7-5700G 32GB/1TB SSD RTX4060 DOS TG02-0411ng

  • AMD Ryzen 7 5700G Prozessor (bis zu 4,60 GHz), Octa-Core
  • 32 GB RAM, 1 TB SSD, USB 3.0
  • NVIDIA GeForce RTX 4060 Grafik (8192 MB), HDMI, DisplayPort
  • Formfaktor: Mini Tower, WLAN, BT, Gb LAN
  • ohne Betriebssystem

Apple iMac 24" Retina 4,5K 2023 M3/16/512GB 8C GPU Silber BTO

  • Prozessor: Octa-Core Apple M3 Prozessor
  • Arbeitsspeicher: 16 GB RAM
  • Speicher: 512 GB SSD
  • Grafik: Apple M3 - 8 Core
  • Display: 24 Zoll (59,62 cm) Retina 4,5K mit 4.480 x 2.520 Pixeln

Apple Mac mini 2023 MMFJ3D/A-Z08841334 mini-PC-PC with macOS

  • mini-PC-PC, macOS 64 Bit
  • Apple M2 (8c) 8x
  • M2 GPU (10c) Shared Memory
  • 16 GB RAM, 512 GB SSD
  • Wi-Fi 6E (802.11ax), 2x Thunderbolt 4, 2x USB 3.1 Gen1

HP OMEN 25L GT15-1401ng 8R2T0EA Tower-PC without OS

  • Tower-PC, without OS
  • 2.50 GHz
  • 8.0 GB
  • 1.0 TB HDD
  • 2x USB 3.1 Gen1, 6x USB 2.0

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Buying advice PC systems

Hardware specifications - what to look for when buying a PC

The main components of a PC are the mainboard, the processor, the RAM, the graphics card, the power supply and the hard disk. When buying individual parts - as spare parts or if you assemble a PC yourself - it is particularly important that the individual components fit together or are compatible with each other.

Pay attention to the following points:

  • Does the processor fit on the mainboard? That depends on the socket of the motherboard, see table.
  • What kind of memory does the motherboard support - DDR3 RAM or DDR4 RAM?
  • Does the motherboard fit into the case? The type of motherboard - ATX and Micro ATX are the most common - has to fit the case.

Mainboard socket

AMDAM32009AMD Athlon II, Phenom II
AMDAM3+2009AMD FX series based on Vishera and Zambezi
AMDFM22012AMD Fusion Processors with multiple CPU cores and one GPU core
AMDFM2+2013For example, the APU A10-7850K
AMDFM32015Summit Ridge Processors based on Zen architecture
AMDAM42016Summit Ridge, Raven Ridge, Pinnacle Ridge, Bristol Ridge
AMDTR42017Zen-based Ryzen Threadripper
Intel11552011Intel Celeron and Intel i-series based on Sandy and Ivy Bridge
Intel20112011Intel i7 series based on Sandy Bridge E
Intel11502013Intel i-series with Haswell and Broadwell architecture
Intel11512015Intel Skylake architecture, also the future architectures Kabylake and Cannonlake
Intel1151 rev22017Intel Coffeelake architecture
Intel20662017Intel SkylakeX architecture

The power supply must be strong enough to supply all components with power. You should not save on this component. You can calculate the required power for the power supply. Use the TDP (Thermal Design Power) of the graphics card and processor. You can find this information on the packaging or in the technical data of the components. Add these values together. You can use these reference values for the power consumption of the other components and also add them:

    • Mainboard – 25 watts
    • Working memory - 6 watts
    • Hard disk - 10 watts
    • SSD – 2 watts
    • Optical drive (CD/DVD burner) - 7 watts

The overall result gives you a guideline that you can use when choosing a power supply. Make sure that you choose a power supply that still has some buffer upwards. At full load, a power supply should be utilized to 80%.

Tip: Also consider that you might want to upgrade your system in the future. In order not to have to replace the power supply unit with every component adjustment, we recommend planning generously here.

There are also two different forms of hard drives: SSD (Solid State Drive) and HDD (Hard Disk Drive). SSDs score with higher speeds, but are more expensive compared to HDDs. Many PCs today have two hard drives installed, an SSD to start programs quickly and an HDD to provide a cheaper alternative for large amounts of data.

Software: Operating system

The two most common operating systems for computers are Windows and Mac OS X from Apple. With Mac OS X, you have the advantage that the operating system and computer come from the same manufacturer, namely Apple, and are perfectly matched to each other. Apple also comes with a lot of software, such as programs for word processing and spreadsheets, for video editing or image editing.

software operating system spread

The advantage of Windows is that there is generally more software for Windows. In addition, the model selection is much larger than with Apple computers. If you are looking for an inexpensive entry-level PC, you will also find Windows devices. Apple computers are more expensive and only start at the upper mid-range; the cheapest Mac is the Mac mini starting at 841 Euros.


Which PC is ultimately the right one for you depends on what you want to do with it. For surfing and watching movies and listening to music, an entry-level PC will suffice. If you want to work on the PC and use programs like Word, Excel and other office programs, look around at the office PCs. And if it should be a gaming PC or the PC is to be used for professional image editing and video editing, then it must also provide the necessary performance.

Price-performance winner PCs 2021

 Entry-level/office PC: Lenovo IdeaCentre 310S-08ASR 90G9007VGEMid-range/all-round PC: Acer Aspire GX-781 DG.B8CEG.069Gaming PC: Hyrican Hyrican Striker red 6367 i5-9400F
Operating systemWindows 10Windows 10Windows 10
ProcessorAMD A9-9425Intel Core i5-7400 4x 3.00 GHzIntel Core i5-9400F 6x 2.90 GHz
GraphicAMD Radeon R5 Shared MemoryNVIDIA GeForce GTX 1050 2.0 GBNVIDIA GeForce RTX 2060 6.0 GB
Working memory8 GB RAM8 GB RAM16 GB RAM
Hard drive2 TB HDD256 GB SSD480 GB SSD, 1 TB HDD
PortsWLAN, 2x USB 3.1, 2x USB 2.0WLAN, 3x USB 3.1, 4x USB 2.0WLAN, 4x USB 3.1, 4x USB 2.0
PriceFrom € 397,-From € 666,-From € 1044,-

Assemble or complete system

You have three options when buying a PC: You can buy a ready-made PC system, use the configurator to find the right PC for your needs, or buy the individual components and assemble the computer yourself.

Complete PC system

Complete PC system

This is the easiest way to buy a new computer. You choose a ready-made system and only need to connect it at home. The advantage is that you don't have to do anything besides choosing the PC - unpack it, connect it, turn it on, and you're done. This is the safest method for less experienced users. You may have to cut back on the flexibility of its PC system, since you can only access prefabricated systems.

Assemble PC with the help of the configurator

For advanced users, the configurator is suitable to find the right PC that fits your needs. With a PC configurator, you can choose yourself which components you want to have in your system, but the configurator makes sure that all components are compatible with each other. After selecting the PC, it will also come to you fully assembled. These PCs are usually a bit more expensive than self-built ones, but you can be sure that all components fit together and everything works smoothly.

Assemble PC yourself

Experts can also assemble their PC themselves. This means a lot more work, but you get exactly the components you need and that meet your requirements. Usually, a self-assembled PC is a bit cheaper than a complete system.

When buying individual components, make sure that they all fit together: Is the mainboard suitable for the case? Do the RAM bars fit on the mainboard? Is the power supply strong enough? Does the processor fit on the mainboard? (For more information, see section 1 Specifications).


Office PCs

Office PCs for Word, Excel and Co. are available for under 500 Euros. The requirements for office applications and surfing are low: You do not need a powerful graphics card or a powerful processor to work or surf with it. Before buying, consider how much storage space you need and pay attention to the size of the hard drive(s). Also consider how many ports (for keyboard, mouse, printer, etc.) you need.

  • No graphics card necessary (the on-board card of the motherboard is sufficient)
  • It should be at least 4 GB RAM

Mid-range/all-round PCs for (almost) all cases

If you frequently sit at the PC and also want to use somewhat more complex programs, such as Photoshop Elements or Photoshop CC, or play computer games with medium requirements, then you should make sure that a dedicated graphics card is installed (and not only the Intel HD Graphics, which is already integrated in the processor). As for the working memory, 8 GB is sensible. This way you can also open several programs at the same time. Consider how much storage space and which ports you need when buying. The price should start at 500 Euros upwards for such an all-round PC.

  • Mid-range CPU and graphics card recommended
  • 8 GB main memory (RAM)s

Gaming PC

Gaming PC

Gaming PCs have to be powerful to meet the minimum requirements of current gaming highlights. For an unadulterated gaming experience, it should be at least an i5 processor and an RTX 2060 graphics card. Note that if your PC only meets the minimum requirements for a game, you will only be able to play it with limitations on the graphics settings, and even then often not smoothly. The price for gaming PCs starts at about 750,- Euro, for better systems you have to calculate from 1.000,- Euro upwards. Real high-end gaming PCs also quickly cost several thousand Euros.

  • Graphics card and SSD are decisive here
  • A somewhat older generation can be chosen for the CPU.
  • 8 GB RAM should be at least

Example PC systems for different application areas

Entry-level/Office PCMid-range/all-round PCGaming-PC
HP 260 G3 DM 4YV64EA Mini-PCLenovo IdeaCentre AIO 520-24ARR F0DN006KGECenturion Hyperion 100698014
ASUS VIVO VM65-G095MAcer Aspire GX-781 DG.B8CEG.069MSI Aegis 3 8SD-215
Lenovo V530 TWR 10TV0028GEDell OptiPlex 3060 SFF-CR41DMedion Erazer X67113 Gaming PC


Depending on which software you want to use on your PC, the computer must have the appropriate equipment. Office software also runs on inexpensive computers with less performance, but a gaming PC needs more power. More power is also required for professional image editing or video editing. Here, you should at least go for a PC with an Intel Core i5 or Ryzen 5 processor, a graphics card like the Nvidia GTX 1060 or better, and 8 GB of DDR4 RAM. The hard drive has to be large enough, since current games need a lot of space - a gaming PC should therefore have at least 1 TB. If you want a future-proof gaming system that will still allow you to play the latest blockbuster games in the next two to four years, the PC should have at least an i7 or Ryzen 7 processor, an RTX 2060 or 2070 graphics card and 16 GB of RAM.

If you are on a tight budget, you can save a bit by not going for the latest hardware, but fall back on the respective predecessor components. For most current games, it does not have to be the latest hardware.


The basics - mouse, keyboard, monitor:

You can't do without these three: a PC includes a mouse, keyboard and monitor. With all three, there are various things to consider.

Find the right mouse

computer mouse

When it comes to the mouse, the question is whether it should be wired or wireless. The advantage of a wireless mouse is obvious: There is less cable clutter. In addition, you are more mobile, for example with a laptop. For this, you need a battery - and ideally always spare batteries in the house. A mouse with a battery and charging station is more practical, but it also has a cable. Gamers like to use mice with a cable because the response time is a bit shorter. In addition, they are usually more precise. Wireless mice often have a laser, which is less accurate than an LED sensor.

If you work or play a lot on the PC, an ergonomic mouse is recommended, i.e. one that has a depression for the thumb. Besides the obligatory right and left mouse buttons and the mouse wheel, many mice also have other buttons that are freely programmable. This is not absolutely necessary for most users, but it can be a real relief, for example, for quickly scrolling back and forth in the browser. Gamers use the programmable keys to assign certain actions to them, which simplifies gaming and often makes it more comfortable.

Characteristics pc mouse:

  • Wireless: less cable clutter, more mobile, but requires batteries
  • Wired: no batteries needed, faster response time, more accurate
  • Mouse with charging station and battery: flexible, but also with cable (depending on the location of the charging station, but less annoying than with a wired mouse)
  • Ergonomic mouse: Good for long work and play
  • Mouse with programmable buttons: more comfort, interesting for gamers

Find the right keyboard

pc keyboard
There are also variants with and without cables as well as ergonomic keyboards. As a rule, it is sufficient for the keyboard to have a palm rest. An ergonomic keyboard is more comfortable if you work with it for a long time. However, it takes some getting used to and is more expensive than keyboards that are not ergonomic. With a wireless keyboard, you are more mobile and have less cable clutter. However, you will need batteries.

You can also choose between a mechanical and a conventional, so-called rubberdome keyboard. The conventional one has a rubber mat under the keys, which triggers the contact for the keyboard command. It is usually cheaper than a mechanical keyboard, and also quieter to touch. However, mechanical keyboards are more durable - should a key break, it can easily be replaced.

Features keyboard:

  • Wireless: more flexible, but needs batteries
  • Wired: no batteries, less flexible
  • Ergonomic keyboard: Comfortable, even if you work with it for a long time, takes getting used to, more expensive
  • Rubberdome keyboard: cheaper than mechanical keyboard, quieter, less durable
  • Mechanical keyboard: durable, individual keys can be replaced, more expensive

The monitor

pc monitor
You should not buy a monitor smaller than 21 inches these days. If you want to watch movies on your PC or play games, a 27-inch monitor is recommended. More screen diagonal means a big plus in comfort. But other features are also decisive for this:
    • Hertz: The refresh rate - 60 Hz is sufficient in most cases, 120 Hz or 144 Hz are recommended for fast gaming and video editing
    • Response time: Is important for moving images (movies, games), should not exceed ten milliseconds, the lower the better
    • Contrast: Describes the ratio of black and white pixels, should be at least 350:1, the higher the front number the better
    • Brightness: luminous intensity of the monitor, is specified in candela per square centimeter, should not be less than 200 candela/cm³, the higher the better
    • Ports: HDMI, DVI, Displayport - a DVI connection requires an additional cable for sound transmission, HDMI and Displayport do not; VGA connections are no longer up-to-date; make sure that the monitor's connection also matches the PC's connection or use an adapter
    • Matte or glossy: A matte monitor has the advantage that it can be placed anywhere because there are no reflections. A glossy monitor has stronger colors and higher contrast values. Which is more suitable for you thus also depends on where you place the monitor. For office work, a matte display is the better choice, for image and video editing and for gaming, a glossy monitor can be useful..

Make sure that the monitor and graphics card are compatible. Some monitors support FreeSync technology, which is supported by AMD graphics cards. Others rely on the GSync standard, which only Nvidia graphics cards support. FreeSync and GSync are technologies that ensure that the graphics card and monitor work in sync. If a monitor supports neither, it will be compatible with both Nvidia and AMD graphics cards.

The good sound - loudspeaker

Many monitors have built-in speakers, but external speakers are still recommended for the PC because the sound quality is simply better. Depending on how important the sound is to you, a 2.0 or 2.1 speaker system will do. Alternatively, go for a 5.1 or 7.1 system with surround sound. The front number stands for the number of speakers and the back number for the subwoofer.

Headsets and microphones

If you listen to a lot of music, watch movies or play on the PC, but do not want to disturb the people around you, headphones are recommended. For movies and music, normal headphones without a microphone are sufficient. For gamers, it should either be a headset (headphones plus microphone) or headphones and an additional table microphone to be able to communicate with fellow players in online games. There are also headphones with surround sound. These are also suitable for movies and music, but are especially important for gaming.

Trend of the future: VR glasses

They are already all the rage among gamers and nerds: VR glasses such as the Oculius Rift. VR stands for virtual reality. These glasses are especially interesting for cineastes and gamers, as they let the user dive even deeper into the world of movies or games. If you are interested in VR glasses, consider the system requirements:

Minimum requirements Oculius Rift:

    • Graphics card: Nvidia 970/AMD 290 - recommended: GTX 1060/AMD Radeon RX 480
    • Processor: Intel i3-6100/AMD FX4350 - recommended: Intel i5-4590
    • Working memory: 8 GB
    • HDMI: one free HDMI 1.3 port
    • USB: 1x USB 3.0, 2x USB 2.0 - recommended: 3x USB 3.0, 1x USB 2.0

Furthermore, be sure to test VR goggles in advance to find out if you are susceptible to "motion sickness." As fascinating as virtual reality is, putting on VR glasses can cause nausea, similar to typical motion sickness. Currently, developers are still working on systems to make the experience as pleasant as possible.

Other accessories - nice, but not mandatory

  1. Printer and scanner or multifunction printer (printer, scanner, copier, fax)
  2. External hard drives, USB sticks, NAS
  3. Mousepads
  4. Webcam
  5. Controller, Joysticks, Gamepads
  6. Gaming chairs
  7. Desks

Ergonomics - for healthy work at the PC

Another aspect of the monitor is ergonomics. A height-adjustable monitor can be precisely adjusted to the user. By the way, the same also applies to the chair on which you sit at the PC. After all, this is the only way to set up your workstation - or the place where you play - so that you adopt the correct posture that will prevent you from back pain and eye strain. A height-adjustable table can also be useful to achieve the optimal posture in front of the PC.

Possible problems and solutions

Computer does not boot

It may sound trivial, but sometimes it really is the solution: If the PC makes no noise at all, check the power switch. The toggle switch is usually located at the back of the computer.

If the power switch is set to "on", check the power cable. If the power cable is also seated correctly, either the power supply - a common reason - or the motherboard could be defective.

If the PC emits beeps when it is switched on, but does not boot up, it is a hardware defect. These BIOS beeps (beep codes) can be used to identify which component is defective or incorrectly installed. This allows you to replace individual components. If you don't trust yourself with the exchange, the beep codes also help the expert to quickly find and fix the error. A list of the beep codes and their meaning can be found on Wikipedia. Translated with (free version)

Can I repair my computer myself?: In many cases, you can repair your PC yourself. A power supply unit or a graphics card can be replaced relatively easily. However, make sure that the power supply has enough power and that the graphics card fits the monitor. Be careful when installing the graphics card so as not to damage any other components. However, you should keep in mind that with ready-made PC systems, you will usually lose your warranty if you open the case. If you have assembled the PC yourself, you can also open it without hesitation. Translated with (free version)

Most common sources of errors

Among the most common sources of errors that can be determined by beep codes are graphics card and the RAM. If you start your PC and don't hear any beep at all (a short beep means that the computer is booting properly), don't get a screen signal, the fault is usually with the power supply.

Computer does not recognize cell phone

If the computer does not recognize the phone, the first step is to restart the phone and the computer. If that still doesn't do anything, try a different USB cable and USB port on the computer.

Under Windows 10, there may be problems with the detection of the cell phone. Open the Device Manager. If the phone appears there with a yellow exclamation mark under "portable devices", right-click on the phone and select "Search for driver software on the computer". Then select the item "Search from a list of device drivers on the computer" and now select "MTP USB device". Now confirm with "Next" and install the correct driver.

Computer simply goes off

If the computer simply goes off, this can have many causes. First, consider whether you have changed anything on the PC. If so, reset the computer to its previous state. In Windows 10, go to the Control Panel, select "Open System Restore" under "Restore" and follow the instructions. If you have recently installed new hardware or connected a new hard drive, this may also be the cause.

A common problem when the computer simply goes off is the temperature. Use a program to test the temperature of the motherboard and hard drive. Also clean the fans - many temperature problems can be solved this way.
A virus can also cause the computer to simply go off. Have a virus scanner check for viruses and Trojans. You should also check the power options - sometimes these are simply set incorrectly and the computer goes out because of this.

The power supply can also be to blame for the PC simply going off. Especially if it is an older model, a defect is very likely. Replace the power supply and make sure that the new one has enough power.

How to

Your PC is slow? - How to make it fast again

If the computer becomes slower and slower, you should first remove the data junk that has accumulated over time. Programs such as the free CCleaner are suitable for this. Defragmenting the hard drive can also be helpful here. Another reason for a slow PC can be a virus. In addition to an up-to-date anti-virus program, which you should always have active, Malwarebytes is recommended here, which is also free in the basic version. The program detects viruses and Trojans and helps to remove them.

If the computer is already somewhat older, a new installation of the operating system can be useful. First make a backup copy of all files stored on the computer and make sure that you have an installation medium for Windows - you should create this for a new PC immediately after startup!