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Actually, nevermind. I just solved it; i had one of my speaker cables plugged into the microphone jack; but the jack had not been reassigned; removing the cable from that jack/reassigning the jack as audio out solved it >.>

Basicly, most of the time if i move the speaker cables; i'm not sure if it's the power cable or the sound cables (they both run into the subwoofer) the subwoofer will give a big 'thud' noise. can also get it to happen if i kick the subwoofer; though whether thats just because it moves the cables...

seeing if your psu works fine in your dads computer would certainly help; idealy you would then (if it didn't work in your dad's) test your dads psu in your computer and see if that then solves the problem.

Do you have any known working PSU you can swap in? Certainly sounds like the PSU from what you've said (gpu fan not spinning as fast, weird noises, not powering up at all some times)

A new motherboard (£30) and problem is immediately solved!

I understand the PSU might've been faulty; that doesn't explain why it works fine in my other computer, and why my other computer's PSU failed to solve the problem? a £30 diagnosis or new PSU would actually be just as expensive as a new motherboard at this point; heck i've barely even found...

unfortunately no :P That's one of the first things i tried swapping any time this happened, along with clearing the CMOS values. (And did it again just now 'just' incase)

Okay, so outside of the case it is exactly the same. Most of the time it doesn't post. Very occasionaly it will. Equally, most of the time it doesn't issue any hardware fault beeps when no ram is installed, and very occasionaly it does; i'm guessing these are the occasions in which it would...

I don't have access to any other PSU. But you're suggesting that neither PSU are powerful enough (with degradation) to power a barebones system; but both powerful enough to power a full system with (barebones) virtually-identical spec? (at virtually zero-load?)

The computer has always powered up, but it now very infrequently posts (when it does, the system is TOTALLY stable until it next is turned off/suspended) I have now tried using my cpu in this computer, and everthing was fine. To try and be 100% sure i've also tried my RAM in this computer and...

update: with no cpu connected the system powers up but issues no beep still.

I don't think psu power is the problem. Apart from the cpu (the one in the non-functioning system is slightly more powerful) the two systems are exactly the same spec, except that the known working psu is 100w less powerful, but is working in this almost identical system which also has 2 hdd's...

Well a summary of events is: Computer doesn't post, or give any error beeps; even if there is no gpu installed, or no ram installed with nothing else connected like hdd's dvd usb devices etc. Swapping working ram doesnt help. Swapping working psu doesnt help. Swapping working graphics doesn't...

Eitherway i guess i'm going to have to remove both cpu's to determine if the mobo/cpu is at fault. Probably means i should reapply thermal compound to them both?

I'm going to assume it's safer with a potentially damaged mobo to test my potentially damaged cpu in a known working system, rather than testing a known working cpu in a potentially damage mobo?

Okay, i tried swapping PSU again, and as expected; it didn't solve the problem. The computer did begin to respond more normally at one point (actually once i swapped BACK to the original PSU). It managed to post once, and turned off with power button a couple times, but overall still exactly...

.. (for some reason forums duplicated my post)

even with no ram inserted it doesn't give any beeps signalling an errror or anything. It almost seems like the BIOS doesn't even start up, never mind check the system or post.

before swapping ram i tried either stick in other slots too, and no difference

I guess i should try swapping the PSU once more, and failing that swap out the cpu so that the only thing remaining unchecked would be the mobo.