My MBP has been playing up for a while now by not waking from sleep. The problem comes and goes and I can't pin point any particular item that sets it off. After setting the screen saver last night before bed I woke this morning to no screen at all. The computer still runs and I can control it from my iMac with Screen Sharing. The external monitor is left plugged in. If I check the display prefs there are no screens at all, only 4 resolutions. I have restarted, Reset the Power Management but it still won't show up. Has anyone seen this one before?