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PC Won't Sustain Power

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#1 AdumbCopper


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Posted 16 July 2015 - 08:23 PM

I've been using this system almost every day for the past 7 months. It has worked completely fine with no indication of error at all, but now it will not power on. Whether I use the casr button, the button on the mobo, or jumping the pins, it flashes on really quick and then turns off. It's just enough time for my LEDs to flash on and for the fans to rotate a few centimeters. It's not enough time for the mobo to post any error codes, so I can't be sure what's wrong with it. I was building a PC for a friend, and his acted similarly when I tried to jump it after forgetting to plug in the CPU power, so I think that either my 8-pin CPU cable is broken, or my CPU itself. I just wanted to get a second opinion. I have done the standard testing of switching surge protectors, unplugging the power supply and most of my components, and trying everything one by one, although I don't have a replacement CMOS battery so I haven't tried that. I really appreciate anybody who can offer help or advice. Thank you.

System in case anybody might need:
CPU: 4690k
GPU: GTX 970
Mobo: Gigabyte G1. Sniper Z97
PSU: Rosewill Lightning 800w

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#2 technonymous


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Posted 16 July 2015 - 09:13 PM

Check all the wiring inside unplug and plug back in. If the bios battery is shot it won't boot. Bad memory card the system won't boot. Bad cpu won't boot. Video card can cause it not to boot. Shorting or ground faults will keep it from booting, bad motherboard. There is many things that can cause a system to not boot. I would start with the bios battery. You have rule out that possbility. They only cost a couple bucks from any store that carries batteries. CR2032.

#3 AdumbCopper

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Posted 16 July 2015 - 09:22 PM

Thanks. I will try that first.

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