I just put together a new build. I turned on the power, the blue power light cam on then the fan started. Immediately after a few seconds it seemed the mother board went pop, and everything shut down. I also noticed I fogot to take off a coulpe of plastic bits of the video card. So I tried powering on again and nothing happened.
I've just discovered I only put the six pin part of the graphics power supply and not the little 2 bit piece. But surely that would only mean the graphics card wouldn't power up, not the mother board short? I tried to power it up again and obviously nothing happened.