Why does a computer shut down under load?
An unexpected shutdown does not automatically mean a failed power supply. Repeated stress testing can add risk before the cause is known.
Shutdown, restart or a blank screen?
Does the whole computer switch off, restart or simply stop displaying an image? Note whether sound or fans continue. Record the game or application and the time before the failure. Those details help avoid replacing an unrelated component based on a vague description of the problem.
What diagnosis should cover
Heavy workloads increase heat and change power demand, making cooling and power stability relevant checks. Memory, graphics hardware, connections or software can also be involved. One symptom does not establish the cause.
- List recently installed components and their exact models.
- Keep any error message shown before the shutdown.
- Note whether the failure follows a particular workload or environment.
Take safe first steps
With the computer off, check externally for covered air openings. Stop using a damaged power cable or equipment that smells burnt. Never open the power-supply enclosure: internal components can remain hazardous after disconnection. Avoid changing voltage settings or repeatedly running demanding tests just to reproduce the fault.
Prepare for service
If the system remains stable during light work and has no danger signs, protect important files with a backup. Bring the component list and a timeline of the issue. A temperature reading needs interpretation for the specific component; there is no single limit for every processor. After repair, the original workload should be checked under controlled conditions.
Further reading
This article is a general guide. Follow the manufacturer’s instructions for your particular device.
