For some reason my computer wont boot when I turn it on. The light comes, on and the fans come on and it sounds like its going to, but nothing happends. The fans work, the PSU is fine, the video card it fine, the hard drive is fine, the RAM is fine, everything looks fine. Could be the motherboard, but then again, the fan is working and the lights on. So maybe the CPU? What could be run and what can I do to fix it?