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Computer won't boot for more then 3 seconds

Just built my friend a pc a little while back I've done almost everything I can think of.
He is running
2x gtx 460s
16 gb of gskil ripjaw
Amd phenomx4 black edit.
Msi nf750
And a 600 w psu

at first we smelt a burning smell from the inside of the case so we un hooked everything and decided that it was coming from the main board by the CPU. We sent the mother board and CPU back to new egg they sent a bran new motherboard but the same CPU witch made me believe that the CPU was fine. I hooked everything back up and it wouldn't turn on for more then 5 seconds or even run bios . So I looked up some stuff and some people recommend a higher watt power supply so I got s 1000w psu now it Is doing the same thing I am running out of options ideas and money. Please help.
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JAtkins3
Asked:
JAtkins3
1 Solution
 
Sean ScissorsProgram Analyst IICommented:
I had the exact same issue. My fix was that the power supply required a 24-pin connector AND an 8-pin connector to both be plugged in. Since I only had one it was the issue. When that happens the issue is usually the power supply. Make sure it is hooked up properly and in its entirety. If it is then try moving the RAM around. Taking sticks out and leave only one and then try all of them in different slots. Hardware malfunction can cause that as well.
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JAtkins3Author Commented:
This did not work!
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jrgcomputingCommented:
I now this may seem daft but try plugging just the montor in and switching on. Sometimes a faulty usb device can stop a system from booting
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JAtkins3Author Commented:
It's more complex then that. I just so happend  I unplugged the 4pin power connector on the motherboard and now the system boots up. I cannot get any video from any of the video sources such as onboard or any of the 2 gfx cards I have installed I tried all ports on both gfx cards I removed one and tried to run just a single and it is still notnworking
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JAtkins3Author Commented:
Must order a new cpu. The CPU is fried. Thank you all for the help
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JAtkins3Author Commented:
Found the problem
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Hugh McCurdyCommented:
I don't want any points for this but I'd like you to ask yourself, why is the processor chip fried?  You might want to replace the power supply.
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