Last night my PC went pop. While gaming the whole thing shut down and then kicked back into life but with nothing on the screen other than the "no signal" message. At first I thought it was the GPU but on further investigation tonight I fear it might be the CPU. Is there any visual clue other than the CPU idiot light on the motherboard and a blank screen, that it's gone kaput? I've taken it out of its mount but it looks as it should.