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Power Supply, No Boot Up

Discussion in 'Hardware' started by zaarenoc, Jan 26, 2007.

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  1. zaarenoc

    zaarenoc Thread Starter

    Jan 26, 2007
    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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