Before I lug this thing to the Apple store, I was wondering if anyone could possibly help. I have an iBook G4 and rarely have problems with it. But a couple days ago, I tried backing up some pictures to a CD-R and my computer scanned it, but then "spit" it back out. It also made a really high-pitched noise- kind of sounded like a loud fly. Today, I went and bought a lens cleaner disc, ran it, and it did nothing. I have deleted many items, so I think I have enough disc space. Please help! I'm a student and don't need/want to spend money!!