IPod recognized by one Mac but not another

I have a fourth-generation iPod. My home computer, which has stopped recognizing my iPod, is a PowerPC G4 running 10.4.11. My work computer, which does recognize the iPod, is a 20-inch iMac (whose specs I don't recall). All software is up to date on both Macs, and I've tried resetting my iPod as well as putting it into Disk Mode to try to fix the problem at home. No dice.
The only thing I can think of that might have affected it is my recent problem with my home Mac's sleep function -- that being, simply, that my Mac doesn't go to sleep when I select it from the pull-down menu.
Could I have affected the iPod by putting my Mac to sleep while it was attached? I've done it many times before without any problems. Or, is there an improper way to wake up the Mac while it is sleeping? Could the iPod be thinking that my Mac is still asleep?
I've also noticed that my home Mac takes longer to boot up and shut down since these problems (iPod, sleep function) developed.
But, again, the iPod works fine with my work Mac.
Needless to say, I am flummoxed. Thanks much for any insight!

Do you use FireWire or USB to connect the iPod?
If USB, try disconnecting ALL of your peripheral devices including any hubs, except for a standard keyboard and mouse. Try the iPod connected directly to the Mac's USB port. Be sure to try more than one port.
If FireWire, make sure it is connected directly to the Mac's port instead of daisy chained to an external drive or connected to a FireWire hub. Try it on more than one port, since it is possible the port has become faulty. If you have another FireWire device, use it to make sure the port is OK.
If the Mac itself is running oddly, you need to start up from your Mac OS X installation disc (for the OS version you are using), and run Disk Utility from Installer's menu. Then run +Repair Disk+. If that completes with no errors or errors that are repaired, restart normally. Then run Disk Utility and use +Repair Disk Permissions+. Hopefully, those actions will fix the Mac.

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Hi Daniel,
Then the only option I see is that the If statement is true in one database, and false on the others.
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oApp.MessageBox("Please enter a Car Registration on row " & oRowCount)
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One of this is should be different on the companies.
Nothing else comes to my mind.
Regards,
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