External drive isn't being recognized

I have two external drives, each one an image of the internal drives. I have moved around my entire stereo and computer setups, new desks, that kind of thing. Now one of the external backups is being 'seen' and the other is not. Both appear to be working by way of lights on the front of them, but only one is showing in the finder as recognized.
I tried switching out the USB cables and that made no difference, so I ruled out the USB cable possibility. I tried plugging them into different usb ports, no difference. The 'dead' one appears to turn on and has power, is confirmed plugged into the computer, but isn't being 'seen' by the finder.
It is an IOgear ION external hard drive.
Any troubleshooting ideas or suggestions on what I can do? I would like to ensure it is working as it is intended to safeguard the video data I have on it.
I have a powermac G4 1.42 duel, mirror doors, 2 gigs internal ram, latest updates on all software available, using USB 2.0 card/adapter.
Thanks
PowerMac G4 1.42 duel   Mac OS X (10.4.6)  

Thought you could use this info about getting FireWire to work!
First, you should always Repair Permissions in Disk Utility before and after any update; I would do that now. If you installed your update with FireWire plugged in, your Mac may not recognize it anymore.
Try resetting your FireWire ports by disconnecting all FW devices, shut down your Mac and unplug it from AC power (wall socket) for 30 minutes. plug it back in and try FW.
If that did'nt work, download the combo update from this site (yours may be corrupt), not Software Update, disconnect all firewire + USB devices except keyboard + mouse, Repair Permissions, re-install update, Repair Permissions again + try. Yours is the 10.4.6 Combo update. Others reading, download the Combo that applies to your system.
If that still did'nt get it Zap the PRAM. While restarting Mac hold down the following key combo Command-Option-P-R. Keep holding those keys down till you hear the second start-up chime, then release.
For those of you with Macs that are not PowerBooks or iBooks, a bad internal battery can cause FireWire to not be recognized, so make sure it's good! Also, here is Apple doc.#88338 on getting FireWire to work.
Good Luck!
Cheers!
DALE

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