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Old 05-13-2013, 04:48 PM   #6 (permalink)
Joe C
Wizard Techie
Join Date: May 2011
Posts: 3,236
Default Re: Fans running wildly, not even close to hot

While your 12v is somewhat low, the 5v looks even worse. The pc might be cycling on the PG (Power Good) circuit within the power supply,
Its purpose is to tell the computer all is well with the power supply and that the computer can continue to operate normally. If the Power-Good signal is not present at startup, the CPU is held in reset state. If a Power-Good signal goes down during operation, the CPU will shut down. The Power-Good signal prevents the computer from attempting to operate on improper voltages and damaging itself.
Power Good Signal - Wikipedia, the free encyclopedia

one of those $12. power supply testers will tell you if the 12v, 5v or PG signal fails
Rosewill RTK-PST Digital LCD Power Supply Tester -

or you might know somebody that has one
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