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Computer boots for 0.5 seconds, shuts off, and repeats unless CMOS button is held

Discussion in 'Hardware' started by Kranken, May 2, 2015.

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  1. Kranken

    Kranken Thread Starter

    May 2, 2015
    So I've been having an issue with my computer for a couple days now. First off, my motherboard is a GIGABYTE GA-FX58-UD4P, processor is Intel i7 920, 8gb RAM and a Nvidia Geforce GTX 660, with an Antec PSU. I recently went to turn it on, and the computer turns on for about 0.5 seconds before shutting off, it stays off for about 3 seconds and repeats thus until I manually unplug the computer power. But when I hold down the CMOS button on the back of the motherboard, it will boot but no video will be shown. The moment I release the button, it shuts off and repeats the original way until I disconnect the power. I have tried taking all parts off the mobo, slowly adding one at a time and noticed that the 8pin connecter right next to my CPU seems to be the issue. I'm unsure if this is a motherboard issue or a power supply issue. It looks like everything is booting up when the CMOS button is held, all fans, hard disk drive, and graphics card turn on. Does anyone have suggestions or solutions to this problem? I've been searching Google and I have seen people come across similar issues, but their fixes were as simple as get a new Bios battery, which didn't help me. any help is appreciated, thank you!!
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