Mac no longer sees 2G iTouch

After syncing fine for months, my Mac Mini last week reported an "unknown" error after trying to sync with my 2G iTouch. Then it suddenly stopped detecting the iTouch altogehter. The facts are these:
1) iTunes 8.2.1 (6)
2) OS X 10.4.11
3) iTouch OS 3.0 (7A341)
4) iTouch model MB528LL, 7 Gb
5) Mac detects and syncs with other, non-iTouch ipods (nano2, nano3, shuffle) with no problem.
6) Mac does not detect iTouch at all. iTouch will not even charge off Mac
7) iTouch is detected, interoperates with and can be charged by old HP computer running Windows XP with no probelm.
8) Have rebooted the iTouch several times to no effect.
9) Have reset all settings on the iTouch to no effect.
10) Have tried connecting using several different cables (all of which have worked fine in the past) to no effect.
11) iTouch works fine in all other respects. I can charge it off the PC or by using a standalone charger. Can download apps, get updates, get email, surf web. Just can't by seen by the Mac anymore regardless of which cable I use.
Wondering if this has something to do with upgrading to OS 3 on the iTouch. Problem started after that. Am I supposed to change a setting in the iTouch or make some change on the Mac in order to have the Mac recognize the iTouch after the upgrade?

Welcome to Apple Discussions
As you may have discovered, just because the other iPods sync, your touch doesn't. The reason for this is that the touch and iPhone use something named Apple Mobile Device Support to handle the communication between iTunes and the touch.
The following article will tell you how to completely remove iTunes and associated pieces of software before reinstalling iTunes and correcting the problem: http://support.apple.com/kb/HT1747
This should correct things but to be totally sure, restart your Mini before you try connecting your iPod again.

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