Just went to use my Powerbook G4 and found it asleep, when I should have been running the screensaver. The computer would not wake from sleep. When I tried to manually power it down by pressing and holding the power button it will not power off. If anyone has any ideas as to what's going on or a possible fix, I would appreciate your advice. Even if it's just temporary so I could get a more recent backup. Thank you in advance!