Okay guys, so basically I had my computer on as usual while I was at school, and when I came back I found it turned off, after being told there was a power-cut. When I try to switch it on, the CPU heatsink and case fans switched on, and then a second after they switch off, and switch on again. This keeps looping unless I cut the power out myself [i.e removing the plug or turning the power switch off] Any idea how I can fix this? This just happened out of the blues, and my computer was running perfectly before this. Help would be greatly appreciated thanks.