I have a laptop with W XP Home, about a 1.6 G Intel processor. Not sure about SP because I can't start the thing! I push the power button and the fan spins for 1-2 seconds then stops, the power light stays on and the thing goes silent and stays dark. I keep turning it on and off and it used to eventually start after 15-20 tries but now it won't. HD light never lights during this. Where do I start? Power supply? thanks in advance. - Chris