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In the middle of use, my computer shut down. I tried to turn it on but it maybe comes on for half a second, shuts down, then flickers again very quickly about 2 seconds later before giving up completely.

So I took everything apart and nailed it down to the power supply, the mobo, or the CPU. I had an extra old power supply around, hooked that up and it had the same problems, so that can't be it.

When the 4 prong CPU connector is not connected, the motherboard 'functions' in that it stays on and runs the heat sink etc. Throw in the 4 prong connector and that's when it doesn't stay on.

So it must be the CPU, right?

Motherboard: ASUS P6X58D CPU: Intel i7-920

Bot are under warranty (supposedly) - should I get both replaced or what?

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It doesn't mean it is the processor, it could still be something on the motherboard pertaining to that socket. Motherboard issues are FAR more common than CPU issues, so I would lean toward a motherboard issue. Do you see any noticeable damage on the board - burn marks, damaged capacitors, etc? –  MaQleod Mar 13 '11 at 23:27
    
I see no damage on the board itself, no. –  scrot Mar 13 '11 at 23:31
    
Could be the power supply, motherboard or CPU. –  Majenko Mar 13 '11 at 23:36
    
@scrot, you’re not talking about the standby power connector are you? –  Synetech Mar 14 '11 at 0:35
    
Synetech - not sure? I'm not as versed as I was with the hardware when I built the machine about a year ago. It's the 4 prong connector from the PSU (or alternatively the 8 prong) that's supposed to power the CPU that exposes the problem. –  scrot Mar 14 '11 at 2:06

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