ITunes skipping/stuttering!

All of a sudden yesterday out of the blue iTunes (7.6.1) starts stuttering/skipping .... sounds "scratchy" "pops" like an old vinyl recording ... on every track always. It makes listening to my music library impossible, useless.
I did a search - nothing posted since December and no real solution.
I am using Tiger 10.4.11 on MacBook Pro Intel. I don't have the problem when playing iTunes on Mac mini. How to get rid of this!!!
Same thing happening when playing music samples at iTunes Store and also during podcasts.
Message was edited by: pwwwayne

I posted a reply Mar 26 to a similar discussion (labeled 'Audio Skip'), following up on post that connected this problem to a USB port on a MacBook. I was having this problem on a new iMac current with all software updates, with no obvious pattern for the skipping other than it happened every time I ran iTunes.
Thinking the USB port might be the problem I first switched the sound from my external harman/kardon speakers to the internal speakers and ran iTunes for over three hours. There was no skipping. I then switched back to external speakers but plugged into a different USB port on the back of the iMac. Several hours of play later I've had no skipping. Other devices plugged into the originally-used USB port are exhibiting no problems so don't think the port is 'bad'.
I'm not a hardware person so don't know why this seems to be working, but the skipping problems seems like a bug to me. I've not changed back to the original configuration to see if the problem returns.
Message was edited by: tlsIA

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