Suprise Dismounts



I recently have been having an issue with a Western Digital External Drive, 120G. The drive randlomly unmounts, or perhaps 0SX unmounts it. Regardless, it seems to also effect my mouse, the only other USB device I use daily.

It's gotten to othe point where I often need to push power for 10 sec to shut down the iMac. This by the way, has corrupted the external hard drive and now no longer mounts...trying disk warrior now, which keeps getting hung up.

iMac 17" G4
1.25 ghz
512 ram

Tried repairing permissions, trying to find a bad plst file and I zapped the PRam for kicks.

I'm frustrated...Any ideas?