hi. i got an ibook g3, and it has a combo drive on it. For a while, I noticed that a DVD would start skipping and playback would be choppy always at the middle of the DVD (could that be the drive having a hard time with the lens at that position), and then suddenly, the Combo Drive starts making loud noises, like someone opening the zipper on a tent back and forth. When this happens, the whole computer seems to be stuck on that, since I can't click on anything else, or quit the DVD Player program So basically, my problem is DVD playback stops functioning towards the middle of any DVD (even new DVDs). Am i alone?