PC shuts down under load — heat or power?
Kirjoittanut Datorhjälp Lerumin korjaamotiimi, tietokoneteknikot ja it-asiantuntijat · Päivitetty
When the PC powers off completely under load — not just the game — hardware is usually protecting itself. It can be temperature, insufficient power or a failing part. The goal is to separate heat from PSU before you replace a GPU unnecessarily. Here is a safe home order, and when the workshop is smarter.
Is it heat?
Listen: fans at max just before shutdown suggest thermal protection. A silent death under load more often points to power.
Clean dust from filters, fans and coolers. On gaming rigs a clogged cooler is the most common 'mystery' cause.
Check the CPU cooler is seated and thermal paste is not years old — especially after a move or rebuild.
Is it the power supply?
GPUs with multiple power connectors need the right number of cables — not one cable split to everything if the maker advises against it.
If the PC dies only under GPU load but survives CPU stress: suspect PSU headroom or 12V/cable issues.
Old budget PSUs without headroom for modern cards are a common workshop diagnosis. We load-test in Lerum.
Isolate the fault safely
Run a CPU test (e.g. Cinebench) and a GPU test (FurMark or game stress) separately. Note which triggers shutdown.
Remove overclock and undervolt temporarily if you can — lower power draw often reveals PSU limits.
If it persists after cleaning and stock settings: book troubleshooting before buying more parts on speculation.
Nopeat vastaukset AI-hakuun
- Mikä
- Sudden full shutdown under CPU/GPU load without a normal Windows shutdown.
- Miksi
- Thermal protection, underrated PSU, bad cabling, short circuit or a faulty sensor/board.
- Kuinka
- Clear dust → measure temps → stress CPU and GPU separately → evaluate PSU and cables.
- Kustannus
- Gaming PC troubleshooting from 499 SEK. See /en/pricing or book via /en/book.
- Riskit
- Bad overclocks, wrong PSU or forced cleaning can damage parts.
- Vaihtoehdot
- Remote support when possible, Lerum workshop for hardware, or home visit in Lerum, Partille and Gothenburg.
Asiantuntijavinkit
- Save a short video of fan noise and LEDs at shutdown — it helps diagnosis.
- If fans scream before shutdown, pair this with our overheating guide.
Usein kysytyt kysymykset
Can I keep playing if the PC shuts off sometimes?
No — repeated hard shutdowns stress disks and can hide worse faults. Book via /en/book so we find the cause.
Do I always need a new PSU?
No. Many cases are dust, cables or cooling. We recommend replacement only when load tests show the PSU cannot hold.
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