I sometimes leave my laptop on and just shut the lid to turn it off. When I open the lid, it usually just turns on. It didn't turn on when I opened the lid, then when I hit the power button, it sounded like it does when it starts up, but the screen is completely black and the fan runs continuously.
I have tried taking the battery out, holding the power button down and then plugging it in without the battery, I have also tried it after putting the battery back in. I have tried opening the two little covers on the back and spraying electronics duster to remove any dust. I have tried starting it with the lid at different angles, I have tried it with the CD/DVD open, and closed....I am at my wits end.
The only thing I can think of is that before I shut it down, I had gone through probably 50 CD roms that had music, data and pictures on them to throw out old stuff. Some discs were marked "data" and wouldn't run.