Reasons why a computer simply "shuts down"?

lyphe

Distinguished
Oct 4, 2010
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My wife's computer began randomly shutting off a couple of days ago. Sometimes it would allow her to turn it back on right away, and other times it just stayed dead for 5-10 minutes before we could turn it back on again.

I'm going to troubleshoot when I get home later today. I have a very small list of things I can think of and thought I'd see if there were any suggestions other people have as to what I should check.

Things I can think of checking:

- psu connection
- temp of cpu and gpu

She has an i7 cpu with an evga mobo and a gtx580 gpu. psu is 750. And her system has run perfectly ever since we built it about a year ago.

She said she thought she heard a surge just before it turned off the first time. I didn't hear it so I don't know if it was a power sounding surge, fan, or something else.

Any advice appreciated and cheers!
 
Yup, most likely the PSU.
Though checking temperatures is a good move, cooling could be compromised in some way and thats causing the CPU to throttle and eventually just kill the system.

See if you can cause the machine to shut off, try running stress tests on both the CPU and GPU to increase power draw, if it shuts off each time (and temps arent the issue) then you can look at the PSU as a probable suspect. From there the only thing you can do is sub in a known working PSU and see if the issue continues.