my iBook G4 (early 04) is randomly ejecting CDs. the first time it happened, it was right before the fans turned on while playing a game. i dismissed it at first, b/c there wasn't a cd in the drive at the time, but now AT ANY TIME, whether a CD is in the drive or not, it randomly ejects. any idea as to what the problem is? i still have applecare, but would like to get a feeling as to what is going on before i take it in.