[Maneater]

I shut down my laptop (under Vista) at night and close lid after it completely shuts down. Had laptop for 2 years no problems but last few weeks when i open the lid to laptop to start it, the screen is already on (all white) but computer is still shut down. I turn computer on and it starts normally. How can I stop the screen from coming on through the night? I have tried to find settings that would help but no luck, any ideas? BTW I always leave laptop plugged into power source.