I'm running an iMac PPC G4 with OS X.5.8. This computer has never had a problem recognising the Iomega External Harddrive before until now. The system profiler detects an 'Unknown Device' on the FireWire Bus, but the logo for the External Harddrive doesn't appear on the Desktop. I've unplugged the FireWire and plugged it back in - I've restarted the computer a couple of times under different circumstances (harddrive connected, unconnected, disconnect computer from power source before restarting, etc.) - I've restarted the harddrive a couple of times (under different circumstances as well) - finally I've reset the PRAM - but none of this has worked. The harddrive seems to be working fine, quietly humming along like always, with the light on (the transformer's light is also on). I don't know what else to do. Please help! Thank you!