For the past few days, my PC has been powering off unexpectedly after roughly an hour of use, whether I'm playing a game or simply sitting at the Windows desktop. Event Viewer only reports an unexpected shutdown. If I turn it back on immediately, the shutdowns happen more often—sometimes within seconds of logging in.
I suspected overheating, but a HWiNFO log showed that all temperatures stayed within normal ranges without gradually rising. I also cleaned the motherboard and tested the memory with MemTest86, which found no problems. Disabling DOCP and running the RAM at stock settings did not change anything.
HWiNFO has warned that my SSD is nearing its end of life, so I'm wondering whether a failing drive could cause the entire system to power off. I'm also considering the power supply or motherboard.
System:
- ASUS TUF X570-Plus WiFi motherboard
- Ryzen 7 5700X3D
- PNY GeForce RTX 5070 12GB
- Corsair Vengeance RGB Pro 32GB, 2x16GB, 3600MHz
- Corsair RM750x power supply
3 Answers
Since changing the memory settings didn’t help and MemTest86 passed, RAM is less likely to be the cause. If you have access to another power supply, that would be one of the quickest useful tests. You can also run the system with unnecessary USB devices disconnected and inspect the motherboard for damaged components or loose connections.
Because it also happens while idle and the temperatures and memory tests look normal, put the power supply and motherboard near the top of the list. Event Viewer’s unexpected-shutdown entry usually only means Windows lost power or crashed; it doesn’t identify the failed component. Reseat the 24-pin motherboard cable, CPU power cable, and GPU power connections, then test with a known-good PSU if possible.
Try logging sensor data with HWiNFO and review the last values recorded before the shutdown. Pay particular attention to 12V and other PSU-related readings, CPU package power, and motherboard voltage sensors. Software readings aren’t definitive, but a pattern may help distinguish a power-delivery problem from a board or drive issue.
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