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Low 12 volt rail

Last response: in Components
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March 4, 2010 12:35:28 AM

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.

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a b ) Power supply
March 4, 2010 2:14:21 AM

You should use a DVM to check it, but 11.1-11.3V is out of specs. It should be 11.4-12.6V and relatively stable.
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a c 139 ) Power supply
March 4, 2010 2:25:39 AM

Brand / Model ?
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March 4, 2010 4:12:22 AM

That voltage would be out of range, but I would check it with a digital multimeter first. Software and BIOS readings are somewhat notoriously unreliable.
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a c 144 ) Power supply
March 4, 2010 4:23:59 AM

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.
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March 4, 2010 7:46:19 AM

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
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a c 124 ) Power supply
March 4, 2010 3:35:15 PM

Full system specs might help to see if you're overloading your PSU, and also its brand and model to help determine overall quality.
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March 5, 2010 12:03:35 AM

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.
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March 5, 2010 12:37:04 AM

If it's reading <11.4V with a digital multimeter, it's out of spec and should be replaced.
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March 16, 2010 2:34:20 AM

Best answer selected by skikarl.
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