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New Build no power

I just but together a AMD3+ FX8150 eight-core 16MB Cache and a Gigabyte 990FXA-UD3 Motherboard, 32MB memory (Kingston). XTI Radeon 1GB DDR3 VGA/DVI/HTMI video card and a Seagate 2TB Hard drive, 650 watt power supply with :pfff: Window 7 64 bit. Would not start up no power, so I Breadboarded the m/b with 1 stick memory, video card and a speaker. jumped the start switch and I don't get any power!. If I leave the CPU 8 pin power supply off the m/b the fans will come on. I think there a short in the CPU? I also removed the battery for about 15 min still no power with both power cables installed.
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  1. Best answer
    Mr TRT said:
    I just but together a AMD3+ FX8150 eight-core 16MB Cache and a Gigabyte 990FXA-UD3 Motherboard, 32MB memory (Kingston). XTI Radeon 1GB DDR3 VGA/DVI/HTMI video card and a Seagate 2TB Hard drive, 650 watt power supply with :pfff: Window 7 64 bit. Would not start up no power, so I Breadboarded the m/b with 1 stick memory, video card and a speaker. jumped the start switch and I don't get any power!. If I leave the CPU 8 pin power supply off the m/b the fans will come on. I think there a short in the CPU? I also removed the battery for about 15 min still no power with both power cables installed.


    Check the back of the motherboard to make sure nothing is shorting out the back of the board anywhere. All it takes is an inadvertent screw, a lack of standoffs or so.

    Past that, you need to start diagnosing the computer issue part by part. Check the PSU (I suspect that works fine) on a different computer first.

    At the 8-pin power, try only a 4 pin first.

    Could very well be a DOA motherboard, but you can't be sure until you test it with other parts.
  2. First try starting up the whole system outside of the case. If it starts then you know it's a standoff or loose screw that is shorting out the motherboard. This is most likely the issue and is one of the most common problems when building a computer.
  3. I got a hold of the tech where I got the board and it was as maxx_power said the 4 pin CPU cable did the trick. I'm up and running now

    Thank!
  4. Best answer selected by Mr TRT.
  5. Mr TRT said:
    I got a hold of the tech where I got the board and it was as maxx_power said the 4 pin CPU cable did the trick. I'm up and running now

    Thank!


    Woohoo!! Sweetness.
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