I have a complete inability to build computers successfully, so when I assembled my HTPC and it failed to do anything I was probably the least surprised of anybody.
It spins up fine, and doesn't cut out. But there's no output on the DVI or HDMI, even when I used the jumpers to force detection, and no lights appear on my USB mouse or keyboard either when plugged in. It's remotely possible that the BIOS is an old one and doesn't support the CPU, but surely if that was the case I'd get some kind of output on the screen rather than absolutely nothing?