I've put this under "Build Advice" because I'm not sure what's up. I shut my computer down yesterday evening, pushed the power button to turn it back on again and nothing happened. I've tried the on-board power button, tried unplugging the front panel button and just using the on-board one, still nothing. So I don't think it is the power button! After being left overnight unplugged, nothing has changed, I've tried playing with the BIOS reset jumper and that has done nothing either. When the computer is plugged in, the standby light on the motherboard comes on, but that's all. No bleeps, no other lights, no change when the power button is pressed. Gut reaction is that the PSU has gone but before going out and buying a new one I wanted to check if anyone had any other suggestions? Getting a spare to try will be tricky, I'd have to persuade a friend to let me dismantle one of their computers and getting all the cable management back properly will take a *long* time. tia edit: just noticed that my PSU isn't in my sig, it's a Hiper Type M 580W - you can probably guess why I think that's the problem!