Low 12 volt rail

skikarl

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Mar 4, 2010
3
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18,510
a computer of mine keeps randomly shutting off, then turning back on and loading back in. it does not tell me that windows has not shut down correctly or anything.

i suspected 2 things

overheating
psu

checked the temps, all good

checked the psu with my psu checker, all good. looked in bios, and the 12v rail was at like 11.1-11.3.

is that voltage acceptable, and it was jumping around there ALOT.
 
Like the other posters above said, "11. - 11.2 volts is out of tolerance." But is is probably worse than you think. Remember, a PSU tester puts a minimal load on a PSU.

Borrow a meter and check between the yellow and black wire on a drive molex power connector while the PSU is running.

With a little over 11 volts, a good PSU would not have let you boot.
 

ronss

Distinguished
Jun 16, 2009
230
3
18,695
tolerance on a psu is 5%, so you should have 11.4 v +.....also, check you heatsink and fan...do you have thermal paste under the heatsink or pad...is the fan running properly
 

skikarl

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Mar 4, 2010
3
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18,510
ok...so, the first post answered my quest. and as far as overheating, its not. and i own a DMM, 3 actually, im not a tech noob. and the voltage i posted was already checked with my multi meter.