What causes CD's played in combo drive through iTunes to skip?

When I play an audio CD in my eMac combo drive through iTunes, just about every disc I play skips? When I play them on my home stereo CD player or my DVD player in audio mode they all play fine. What could be causing this?

Hey Matt,
Some of my CD's have slight surface flaws, but the oversampling by the combo drive should take care of that. It does in my video DVD-in-audio-mode player and in my home stereo CD player which does 4x oversampling.
Songs in iTunes do not skip. The skipping is also not the "Max Headroom" type of digital stuh-tuh-tuh-tuttering. It is more like the audio intermittently cutting in and out.
I did some more troubleshooting and discovered that part of the problem was a loose connector. The 3.5mm plug from my external speaker system was not making good contact with the audio out port on my Mac.
The other part of the problem I discovered was that in one of the CD's I was listening to the recording has a sampled vinyl LP in it. The original LP had slightly audible surface scratches on it, and the original analog tape studio recording had dropouts in it. It just sounds real different when played on my Mac through my Klipsch speakers. Here's to that old audio engineering trick where the recording studio mixdown is done through Yamaha studio monitors with the idea that if the engineer can make Yamaha studio monitors sound good, the recording will sound good on everything else. The audio engineer on the Cinematic Orchestra CD titled Every Day apparently didn't use Yamaha nearfield studio monitors
After jiggling the audio connector, Genesis' Selling England by the Pound sounds fantastic once again. Thanks for your input, it helped point me in the right direction. I'll also try cleaning the contacts on my Mac's audio out port with some contact cleaner.
Thanks,
John

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the install of iTunes 7.0.2 and QT 7.1.3, my combo
drive won't play most commercial CD's. Most curious
is that I have so far found ONE commercial CD in my
library that plays just fine, but haven't had the
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