Originally Posted by
VerrKol
I don't have an adequate explanation; I can only say the exact same thing happened to me. My computer initially had similar inexplicable power loss after a period of time 10-15min. I attempted to diagnose the problem using various hardware monitor programs and came up with nothing unusual. The status then deteriorated until I could not power on the computer at all because it would fail to boot, getting as far as the Windows logo at best.
At this point, I attempted to replace the power supply which did nothing. I then broke out my DMM to try and determine if there was a short somewhere along the line (there wasn't). After much frustration and head scratching I noticed some slight discoloration near the CPU fan and decided to use a heat probe when I turned it on.
Despite several software programs reporting normal temperatures, the CPU sensor area was reaching over 100 C and simply reporting it incorrectly. It's rather remarkable the safety shut down functioned properly.
If I had to guess the exact cause, repeated shut downs due to overheating triggered some secondary precaution related to fan monitoring. It seems a bit far fetched, but simply swapping fans did the trick and I've been fine ever since. If I were less frustrated and more inquisitive at the time, I might have tried simply unplugging and reattaching the fan to see if that allowed the OS to boot.
It could easily be the power supply; I just wouldn't rule out overheating until actually tested.
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