I bought a MAC G4 and it seems to have problems with the Panther OS X and the sleeping mode. It's the second time that the screem becomes completely black, it doesn't matter if I force quit and try again and I can even hear that the computer is working fine. I tryed to start from the CD, but it also didn't work. I've heard about the sleeping problem that even if there is a OS upgrade, it'll still have the problem (or a different one). Could you please advice me of the best thing to do?