I overclocked my E8400 from 3ghz to 3.6ghz. And my GT from 660MHz to 750 mhz. And it was running great for about a week I turned off my computer overnight and i wont start up why!!!!
lol... owned? ok try this: remove the battery, power cycle, then put it back in and retry. if that does not work - try rechecking the connection between the on button and the mobo.