I have a P755 that's been working fine but this morning I tried to turn it on and the screen in black. I've tried removing the battery/disconnect the power cable thing twice with no results. The fan turns on but sounds like it doesn't fully turn on like normal. Last night I closed it and normally after about 10 seconds it turns off but this morning the power button was still lit when I opened it. I've tried holding the power button and the ESC key as well.