my pc turns on for a quarter second and shuts off

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gokitty199

gokitty199

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Feb 4, 2013
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ok so far what ive done is replace the motherboard as the old one was fried, then the new one appeared to be a dud then i got the same board as a replacement. ive tried changing the power supply to the one im using in my current pc so the power supply is good.
compontents are
radeon hd 3870
amd phenom ii x4 965
ASUS M5A97 R2.0 AM3+ http://www.amazon.com/ASUS-M5A97-R2-0-SATA-Motherboard/dp/B008V9959O/ref=dp_ob_title_ce

and a 600w psu. any suggestions

edit: also ive changed my cpu to my old amd phenom ii 6 something. cant remember the number and it still did the same thing
 
Solution
Tom Tancredi
I had a case, that for the life of me I couldn't find the short on it, but it was the case itself. Soon as I moved it to a cardboard box/wood board (breadboarding) everything worked right, soon as I mounted it, PFFT! Have you tried disconnecting everything, lay the Mobo on it's cardboard box, plug in the CPU, 1 stick of RAM, GPU, then run case power switch to the board. Now attach all the power leads from the PSU, and turn it on. Does it work to BIOS now? If not then Mobo/CPU/RAM/PSU/GPU is culprit. If so, then try with second stick of RAM, still work? If so then unplug the power and GPU, seat in case, plug in GPU and power and see if works. If it shorts now then the case has a fault somewhere.

If it failed during breadboard, do you...
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Onus

Onus

Titan
Jan 27, 2006
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An immediate shutoff like that suggests a short. Is the mobo mounted on standoffs OR raised bumps, and has a standoff under it only where there is a mounting hole? Check for foreign objects (e.g. a loose screw) trapped under the board.
Disconnect all your drives and fans, and see what happens. If the system stays on, one of them may have a short in it.
 
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gokitty199

gokitty199

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Feb 4, 2013
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thanks ill try those, my motherboard is raised slightly on standoffs
 
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Tom Tancredi

Tom Tancredi

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May 9, 2013
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I had a case, that for the life of me I couldn't find the short on it, but it was the case itself. Soon as I moved it to a cardboard box/wood board (breadboarding) everything worked right, soon as I mounted it, PFFT! Have you tried disconnecting everything, lay the Mobo on it's cardboard box, plug in the CPU, 1 stick of RAM, GPU, then run case power switch to the board. Now attach all the power leads from the PSU, and turn it on. Does it work to BIOS now? If not then Mobo/CPU/RAM/PSU/GPU is culprit. If so, then try with second stick of RAM, still work? If so then unplug the power and GPU, seat in case, plug in GPU and power and see if works. If it shorts now then the case has a fault somewhere.

If it failed during breadboard, do you get any beeps? If not lets force a beep, remove the GPU, does it beep now? If not this tells us there is probably a problem with the MOBO. Unplug the power cord from wall, wait 10 min, then remove the battery for BIOS. Wait 10 more minutes plug in battery then power cord, does it beep now (that the GPU is missing?) If not then the board is dead, the PSU is underpowering or the CPU/RAM is getting in the way and causing a short / fault the board.
 
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Solution
gokitty199

gokitty199

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Feb 4, 2013
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ok i did all of that and put the battery back in and plugged it into the wall and did not hear a beep with the graphics card out, but the pc turned on and the fans stayed spinning, when i plugged the graphics card back up it went back to turning on for a split second, when i unplugged it and left it in the motherboard, the fans spun again when i pressed the power button including the graphics card fan. any ideas? also should i take out my 670 thats in my other pc and try it in this motherboard?
 
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gokitty199

gokitty199

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Feb 4, 2013
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ive taken the motherboard out of the case and layed it on the motherboards box it came it, i have the cpu and the cpu cooler and one stick of ram. the pouwer supply is hooked to the 8 pin cpu connector and the large motherboard one(idk how many) and it turns on and runs and all the fans spin. when i set the graphics card in the motherboard and plug it up to the power supply the fans do a quarter turn and stop like it gets power for a split second and stops. when i unplug the graphics card but leave it in the motherboard all fans spin again including the one on the graphics card
 
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gokitty199

gokitty199

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Feb 4, 2013
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yes im using a PCIe 6 pin. would it be a good idea to take my 670 out of my pc im on now and plug it into the motherboard and see if it works?
 
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