Hi there, Sorry if these kind of questions have been explained somewhere, if I'm posting wrongly, I apologise! Yesterday morning when I turned on the computer it made this loud groaning/humming/whirring noise (something like that!) which terrified me. So I took the case off and there was an amber light lit up on the motherboard. I turn the comp back on to try and hear where the sound was coming from and it sounds like it's coming from the power supply. After about five or ten minutes of the computer being on, the noise disappears and it's quiet (though the amber light is still on). The same thing happened this morning - noise, then quiet, light still on. I'm worried that something is failing and want to fix it before I suddenly have no computer. Can anyone tell me if it is the power supply? I have no idea about how to replace it... I was looking at THIS one this morning (sorry if I'm not supposed to link) because I "think" it matches some of the numbers on my own PSU, but I don't want to stick he wrong one in and poof, bye bye computer. I'm looking on ebay since my pockets aren't deep enough to go elsewhere. I don't know what details you need about my computer, so ask away and I'll try to provide what I know/can find. Any advice is mucho appreciated! Thanks!