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Gaming PC Won't Boot Up with 8-pin CPU Cable attached to MoBo HELP!

post #1 of 10
Thread Starter 
Alright, so I've been running my Custom Gaming PC with no problems for about 3 months now. I was running FAH Tracker V2 for 6 hours this morning without a hitch. I shut the FAH down and double clicked on World Of Warcraft and as soon as the game went full screen the entire PC shut down. I tried resetting the PSU and powering back on. The green POWER light on my ASUS P8P67 PRO is solid green, however when I press the power button my LED fans flick on for a split second and shut down again, POWER light on the mobo remaining lit green. After a bit of troubleshooting I've managed to make a discovery: If I disconnect the 8-pin CPU Power supply cable from it's socket labeled "EATX 12V" and try to power up, it boots up and stays powered, of course with the CPU_LED lit red since no power is getting to it now. This is very worrysome. Can anyone help me narrow it down to the culprit? The hardware in question is an ASUS P8P67 PRO, a Corsair TX750, and an Intel i5-2500K. The CPU was overclocked to 4.4ghz.

Any help would be greatly appreciated. frown.gif
     
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post #2 of 10
I would think it's either motherboard or PSU. But I'd be leaning towards PSU. I've had machines do that and more times than not the power supply has messed up on me, not the motherboard. Do you have another PSU you can test?
Meh >.<
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Meh >.<
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post #3 of 10
MOSFETS gone bad.

Classic sign is the no boot up with 4/8 pin plugged in and boot up with it unplugged.
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post #4 of 10
These are the culprits:

Either 12V On PSU goes kapoowe, or your Mosfets are down the toilet.
post #5 of 10
Does your PSU have a seperate 4 pin CPU power connector as well? If it does, try plugging that in and see if it solves your problem. You would think they come off of the same line, but I had a Antec PSU that did that and it was the 8 pin that went bad.

The system will boot and run just fine with only the 4 pin. The only time you may notice a difference is going after a big overclock with higher voltages.
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post #6 of 10
Thread Starter 
Quote:
Originally Posted by Crystal_Castles;14499668 
I would think it's either motherboard or PSU. But I'd be leaning towards PSU. I've had machines do that and more times than not the power supply has messed up on me, not the motherboard. Do you have another PSU you can test?

Unfortunately I do not have a spare PSU on hand. I may have a friend that has one though.
     
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post #7 of 10
Thread Starter 
Quote:
Originally Posted by SPARC_PWR;14499714 
Does your PSU have a seperate 4 pin CPU power connector as well? If it does, try plugging that in and see if it solves your problem. You would think they come off of the same line, but I had a Antec PSU that did that and it was the 8 pin that went bad.

The system will boot and run just fine with only the 4 pin. The only time you may notice a difference is going after a big overclock with higher voltages.

The PSU only has the 8-pin.

Anyone else that has had this problem? It's like it gets power for 1/10th of a second. Also, once that has happened, I can't reproduce that result a second time without resetting the PSU (power switch off, then back on). Idk if that helps. Once I have reset the PSU switch, it will power for a split second again. Also, when I have the 8-pin disconnected, it will power, and I can shut down and power it back on without having the reset the PSU.
     
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post #8 of 10
Quote:
Originally Posted by blupupher;14499696 
MOSFETS gone bad.

Classic sign is the no boot up with 4/8 pin plugged in and boot up with it unplugged.
Beat me to it. It's probably more likely the motherboard rather than the PSU.
post #9 of 10
Quote:
Originally Posted by Kaosuonline;14499816 
The PSU only has the 8-pin.

Anyone else that has had this problem? It's like it gets power for 1/10th of a second. Also, once that has happened, I can't reproduce that result a second time without resetting the PSU (power switch off, then back on). Idk if that helps. Once I have reset the PSU switch, it will power for a split second again. Also, when I have the 8-pin disconnected, it will power, and I can shut down and power it back on without having the reset the PSU.

Yup, that what happens when they go out. You get a quick power up to the fansthen nothing, and only a hard reset of the psu will re-create it.

I had the same thing happen:
Quote:
Originally Posted by blupupher;13840400 
Well, you are 100% correct.

I went out and plugged a fan into it (is is bare now with no CPU or RAM) and with the 4 pin unplugged, the fan would turn on. I shut it off, plugged in the 4 pin and when I tried to turn it on, the fan wiggled and stopped, and it think I heard a very quiet "click".

Guess the MOSFETs (whatever they are) are shot.

I know it was not the greatest board, but it was free with the CPU.

Setting up an RMA with MSI now.

Edited by blupupher - 8/7/11 at 3:43pm
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post #10 of 10
Thread Starter 
Thanks blupupher, I'm going the use the info you've provided and conclude with fair confidence that the MOSFITS have gone bad. I can confirm the faint click noise with my MoBo as well.

Given the fact that the PSU will power the ATX socket, the PSU should be OK correct? I'm hoping that the CPU is OK as well.
     
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