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When I turn on my computer after leaving it to rest for 15+ minutes, it will POST and sometimes freeze while loading Windows. 50% of the time, it will freeze for a few minutes once it boots Windows. If it gets past those few minutes it usually won't freeze for at least a few hours, if at all.

When it doesn't POST, the fans just keep spinning infinitely. There're no beep codes or anything, just fans continue to spin with nothing displayed on screen.

If I remove all RAMsticks for example, the computer will usually still make no sounds but the fans will spin forever with no display. If the computer was going to Post anyway, I'll get the standard beep code indicating a ram problem. This is the same with each piece of hardware, and with nothing but the CPU plugged in the results are the same. I'm thinking this must be the psu or the motherboard, but both of these components are new and I don't have another psu lying around to test.

Also CPU-z reports the CPU speed as 1,6 GHz no matter what, even with Intel burn test running and speedstep disabled. Tempratures on all devices are well within the normal range.

Some specs that might prove useful:

  • i7-920
  • GTX580
  • P6x58d-e
  • 750W PSU

The motherboard and power-supply are both new.

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You need to try the standard remedies: remove the battery and clear BIOS (aka CMOS) settings and reset to defaults; try substituting components such as PSU, RAM, CPU, motherboard one at a time. –  sawdust Oct 9 '11 at 23:47
    
Sawdust is right. Do basic troubleshootin for hardware issues first. –  Justin Pearce Oct 10 '11 at 3:56
    
Sorry I'm writing all this on my iPhone so liable to miss things out, OP updated –  James Oct 10 '11 at 6:43
    
If fhe consensus is that it's likely to be a problem with the PSU I'll go buy a new one; looking for some confirmation first before I drop £70 on my second PSU in 2 weeks –  James Oct 10 '11 at 6:59
    
This looks kinda like a motherboard issue if your other components are checking out ok. You tried booting the PC up without the hard drives plugged in? I had a bad hard drive that was causing my Windows boot to hang. What kind of PSU are you using? Is it a higher quality one that has lots of amperage on the 12v rail? –  White Phoenix Oct 10 '11 at 7:00

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