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PC with ECS P4VMM2 V5.0A motherboard won't power up after working for years. Power supply fan doesn't come on, case fan doesn't come on, PC dead. Tried replacing power supply, same result. Power supply comes on when I pull the 24-pin connector and short the power switch leads (pin 14 with pin 15). Voltages look good with multimeter. Tried replacing CMOS battery, PC still dead. What next? Could there be something in the CMOS that is preventing the power supply from powering up?

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  • chuckfay101 Apr 11, 2011

    Should I try clearing the CMOS to see if that helps? What is the downside of clearing the CMOS? How do I reset it to the correct settings?

  • chuckfay101 Apr 11, 2011

    Thanks, Curtiende. I expect the case fan will start working again once the power startup problem is resolved. The motherboard is a micro ATX form factor board, so the main power supply connector on the motherboard is actually a 20-pin connector, not 24-pin as I initially wrote. Like you, I'm afraid the motherboard has failed, but I was hoping that resetting the CMOS memory might help resolve the motherboard problem. Is there any hope that would help?

  • chuckfay101 Apr 11, 2011

    Thanks again, Curtiende. I agree with your suggestion of using the BIOS settings menu instead of removing the battery for the CMOS, but the PC won't even power on, so I can't get to the BIOS setup software. I can't get to any software, not even the power on self test. So I have removed the battery and replaced it, but I didn't use the jumper setting to reset the CMOS yet. Still wondering if there could be some setting in the CMOS that would cause the power supply to sense through its motherboard connector that it should not power up.


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The mother board and the fan also need replacement. If you have recently added any other hard ware to the machine, remove it and try booting again.

Posted on Apr 11, 2011

  • Curtis Otiende
    Curtis Otiende Apr 11, 2011

    Removing the battery for the CMOS ( complimentary metal oxide semiconductor ) will only reset the BIOS (Basic input/output system) to default settings. Instead of resetting the bios by removing the battery, there is also an option within the BIOS settings menu to "Load Defaults" if that is all you are looking to do. I recommend this to avoid the problems that may also be caused by resetting the BIOS and adding more problems that you may not realize because the system is not already working.

  • Curtis Otiende
    Curtis Otiende Apr 11, 2011

    Because there is no power at all. This is clear evidence that the Power supply is not ok. please use a different working power supply that is compatible with your machine and you will know the next problem if there is any.


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