I am sorry if this has been dealt with already, but I could not find a thread about it yet. I recently purchased a 1Ghz TiBook. It was used, but is still less than 6 months old. Panther, Combo Drive, 1024 MB Ram, 60 GB HD. I was watching a DVD on it the other day when it suddenly started "screaming." It was making a really loud, really high pitched noise. It sounded like perhaps the hard drive was spinning incredibly fast, but I couldn't tell for sure. I was able to shut down and this stopped the noise (obviously) but that was the only way to stop it. The next day I was playing Starcraft and it did the same thing again. Both time the only way to stop the noise was to shut down or to close it (so the computer goes to sleep). Neither time did the computer get excessively hot or did anything go wrong, but the noise was absolutely awful. It hasn't happened for two days since, but I don't want to damage my computer. Does anyone have any clue what this could be and/or what a possible fix might be? THANKS!!!!!