External Hard Drive Suddenly won't mount except if connected via keyboard

Hi there guys. I have a generic USB 2.0 Hard drive enclosure that I've been using successfully with my Macs. Today it doesn't work, on any of them.
I connect it via USB to the back of my iMac, and it will not mount. I checked system information, and it finds: (under USB)
- USB 2.0 Storage Device
And it knows this:
USB 2.0 Storage Device:
Version: 1.03
Bus Power (mA): 500
Speed: Up to 480 Mb/sec
Product ID: 0x5621
Serial Number: 00042222200000157768
Vendor ID: 0x0402
If I plug the hard drive in through my Apple keyboard, it mounts fine, but is SUPER slow, like completely unusable. However in this case, system information says:
USB 2.0 Storage Device:
Capacity: 189.92 GB
Removable Media: Yes
Detachable Drive: Yes
BSD Name: disk1
Version: 1.03
Bus Power (mA): 100
Speed: Up to 12 Mb/sec
OS9 Drivers: No
Product ID: 0x5621
Serial Number: 00042222200000157768
S.M.A.R.T. status: Not Supported
Vendor ID: 0x0402
Volumes:
Backup Disk:
Capacity: 189.8 GB
Available: 44.78 GB
Writable: Yes
File System: Journaled HFS+
BSD Name: disk1s3
Mount Point: /Volumes/Backup Disk
So.. yeah. I've got important data on this drive, and I seriously have no idea what to do. I've read a few forum posts around the web and have seen similar problems but not solutions posted. Can anyone help?
What should I try?
-Brian

One last question have you tried theMac OS X 10.4.10 Combo Update v1.1 (Intel)
Note: What’s New in this Version
The 10.4.10 Update is recommended for PowerPC and Intel-based Mac computers currently running Mac OS X Tiger. This update includes general operating system fixes, as well as specific fixes or compatibility updates for the following applications and technologies:
- RAW camera support
- Mounting and unmounting external USB devices
- Support for 3rd party software applications
- Security updates
17" iMac Intel Core Duo - 2GB Ram - Mac OS X (10.4.10) - Maxtor 300GB FireWire - Creative Inspire 2.1 - 2G Nano

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External Hard Drive Suddenly won't mount except if connected via keyboard

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