When I try to wake my MBP from sleep, the screen won't turn on. The sleep light goes away and I can hear it turn back on but the screen remains off. I must hold the power button to turn it off and then turn it back on for it to reset itself. A little background info. I have OWC RAM installed. The type of MBP is the one in my sig. As of now, the only programs installed are the stock ones, Google Earth, iMovie HD, and iStat Pro. Any suggestions?