PC stuck in sleep mode, anyway to clear it?

You really need to try a number of things before you can be certain its the motherboard. It could potentially be RAM, Power Supply, Motherboard, or Graphics Card. Try other components from friends or whatever testing 1 at a time to try and locate the problem.
 
It's not stuck in sleep mode, it's a hardware problem. Try with one stick of RAM.

I've tried with one stick of RAM and it still loops

You really need to try a number of things before you can be certain its the motherboard. It could potentially be RAM, Power Supply, Motherboard, or Graphics Card. Try other components from friends or whatever testing 1 at a time to try and locate the problem.

I've tested another PSU on it, still loops, tested RAM in other PC, works. I would test the GFX card but my other PC doesn't have a PSU to power it's two 6-Pin connectors. But it loops still when there is no Graphics Card plugged in.

No chance of it being CPU? If not, then it's definatly the mobo.
 
Yes, there is a chance it could be the cpu. I've had a computer fail to POST with no beeps before due to a faulty CPU (in theory I think you should get a cpu fail code).
 
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