Like Adunaic, I would be sceptical about it being the Live CD that caused this -- it does sound like a hardware failure.
Assuming this is a desktop PC, then personally, I would open up the case, unplug everything except the primary hard disk (and graphics card if you have one), and see if it can start up then. If you still get no life then I would suspect a failure in the power supply (easily fixable) or the mainboard (bad luck in that case

).