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Black screen, boot loop, BIOS, power supply

Gaming PC won't start

If the PC stays black, reboots in a loop, stops before Windows or can no longer get through start-up, the real risk is buying the wrong part. PC4GAMER starts by isolating the fault: power supply, RAM, system SSD, BIOS, GPU, cable or broken Windows.

Check before replacing

Three levels of diagnosis

The aim is to identify the cause quickly without promising a motherboard or power supply at random.

Start-up check

30 CHF
  • Windows or BIOS still visible
  • Reading the error message
  • Choice between remote and workshop
  • First clear direction

Workshop diagnosis

60 CHF
  • Black screen or boot loop
  • RAM / SSD / power supply check
  • BIOS and display check
  • Most likely cause

Full diagnosis

120 CHF
  • Unstable or intermittent case
  • Longer tests
  • Clear next step: parts / setting
  • Usable report
No-boot signals

What is checked

No pictureVideo output, GPU, cable, screen, POST sequence, LEDs or motherboard codes.
Boot loopRAM, XMP/EXPO, BIOS, system SSD, Windows corruption or the reset of an unstable profile.
Turns on, then cuts outPower supply, short circuit, abnormal temperature, connectors, CPU cooler or graphics card.
BIOS visibleBoot order, SSD not detected, Windows damaged or a failed update.
After an upgradeCompatibility of PSU, GPU, RAM, BIOS, 12VHPWR cable, assembly or a bracket that is too tight.
How it works

How the diagnosis proceeds

1

Symptom

What the PC does when you press the power button, with or without a picture.

2

Direction

Remotely if Windows or the BIOS stays reachable, otherwise at the workshop.

3

Check

Boot, RAM, SSD, BIOS, power supply, display and stability.

4

Decision

Reinstallation, a setting or a part to replace.

These four details make it possible to choose the right check quickly and announce the price before any work starts.
By symptom

Choose the right next step

Once the symptom is better understood, these services let you move forward without starting the request again.

General diagnosis

For a problem that mixes crashes, heat, noise and start-up.

See diagnosis

Gaming PC repair

For a job already understood after the first check.

See repair

Remote help

Only if Windows or the BIOS stays reachable and the case is suitable.

See RustDesk