Why does my MacPro (2008) not recognize my iPod Classic?

Just today, I plugged in my iPod Classic (bought recently; 160 GB), and it doesn't charge or show up in iTunes. Its screen turns on though.
I have OS X 10.8.5, and the latest iTunes.
I can plug it into my wife's iMac (2011) using the same cable and it seems to work fine.
So I reset the SMC, and the PRAM. I reinstalled iTunes twice, and restarted the mac. The only thing that changed was immediately after resetting the SMC, plugging in the iPod had it show up as connected on its screen for a few seconds, then it said "OK to disconnect" and now doesn't respond any more. I also tried plugging it into the other USB ports, including the ones on the Apple Keyboard.
Any thoughts on this? My other USB devices work fine.

Update:
Looks like AppleMobileDeviceHelper is not starting. I cannot figure out how to reinstall this. The Apple page about it is for 10.6 and before. If I try to delete iTunes.app, it says I can't since it's required by OS X.

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