I have a very odd problem.. My PowerMac G5 (the original 1.8GHz) does not recognize my iPod nano on the rear or front USB2 ports. Sometimes it has the Do No Disconnect screen on the iPod, sometimes not. But it does charge the iPod. At first I thought it was the iPod itself (it was a replacement model Apple sent me) but I tried it on an iMac and my Dell laptop and it works fine (that's how I'm transferring my music temporarily). My original iPod nano (that I sent out for repair) worked flawlessly on my PowerMac. After a lot of trial and error, I found that it worked when I connect it to my 20" Cinema Display (the original one, not the newer one). However it is only USB1 and it would be a pain in the ass to use. So then I thought it was my USB2 ports that were problematic. However, all of my USB devices work fine.. external USB2/firewire drive, thumbdrive, laser printer and my phone (which acts like a thumbdrive when connected to a computer, also charges via USB). Things I've tried so far.. - connected my iPod mini - connected another/different iPod nano - deleted iTunes and iPod updater and re-installed again - Archived and install and updated to 10.4.3 - re-installed fresh copy of Mac OS X (currently running 10.4.3) - which I really thought would fix it if it was a software issue - unplugged all devices except iPod - unplugged my PowerMac from wall socket for 15 minutes - reset Open Firmare (reset-nvram, reset-all) - command-option-p-r Then I thought my USB might be fried (but why then would it work for everything else). My latest theory is that there isn't enough power going through the USB to my iPod (although it does charge it, and also charges my phone). Can't think of anything else to do! Edit: When I connect my iPod mini using the firewire cable that comes with it, it works fine. So it seems to be a USB issue.