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I'm working on a computer that won't boot up. I replaced the power supply about 6 months ago. This time the tester says the power supply is good. It's a Pentium 4 machine with the 4-pin Molex plug to the motherboard.
The only exception is the +3.3v indicator will not light up unless the SATA plug is also plugged into the tester. Could it be
that the 4-pin Molex is not needed except when a SATA drive is installed.
This is the one that has to receive a feedbacck signal to turn the power supply on. I'm thinking the 12v CPU fan may be the culprit.
When I connect the fan to a 12-volt supply it works fine. When I start the computer with the off/on switch, you can hear the hard drive winding up, but I have to give the cpu fan a flick to start it turning. Still no video though.
 
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