10.4.9 and now USB Hard Drive(s) Won't Mount

After running the combo updater on my Intel Core Duo iMac 17" my LaCie BigDisk won't mount nor will my 60GB USB hard drive that I use to backup my MacBook (though this drive DOES mount on the MacBook without any problems). All other USB devices (and my 160GB Western Digital USB Hard Drive and 300GB Seagate FireWire hard drive mount and work fine on the iMac). My LaCie BigDisk wouldn't mount on my MacBook at first, but eventually mounted ONCE on the MacBook. I have tried repairing permissions, rebooting, using an older IOUSBFamily.kext (that was a nightmare and required some CLI experience to undo without having to find a firewire cable that long enough to reach around my desk to use the iMac via Target Mode on the MacBook good thing I saved the original).
At any rate here is the error output in Console.app:
Mar 13 20:32:59 iMac kernel[0]: USBF: 426. 4 ControlTransaction: control packet 1 error 0xe0004057
Mar 13 20:32:59 iMac kernel[0]: USBF: 426. 4 AppleUSBEHCI[0x3af4000]::DeviceRequest - buffer dmaCommand (0x39b3900) already had memory descriptor (0x3f54a00) - clearing
Mar 13 20:32:59 iMac kernel[0]: USBF: 426. 5 AppleUSBEHCI[0x3af4000]::ControlPacketHandler - unexpected command BufferMemoryDescriptor(0x46a0d00)
Mar 13 20:32:59 iMac kernel[0]: USBF: 426. 35 AppleUSBEHCI[0x3af4000]::DeviceRequest - dmaCommand (0x39b3900) already had memory descriptor (0x46a0d00) - clearing
Mar 13 20:34:08 iMac kernel[0]: USBF: 495.663 AppleUSBEHCI[0x3af4000]::Found a transaction which hasn't moved in 5 seconds on bus 253, timing out!
[Above Repeating for a long time]
Mar 13 20:34:12 iMac kernel[0]: USBF: 499.351 [0x3bd7800] The IOUSBFamily is having trouble enumerating a USB device that has been plugged in. It will keep retrying. (Port 2 of hub @ location: 0xfd300000)
Mar 13 20:34:12 iMac kernel[0]: USBF: 499.352 [0x3bd7800] The IOUSBFamily was not able to enumerate a device
Any help would be appreciated!

Anyone else having this problem?
Possibly.. my Lacie hard drive (firewire) has stopped working since I updated to 10.4.9 with the device attached. See: http://discussions.apple.com/thread.jspa?threadID=889519&tstart=45
iMac G5 iSight 2.1GHz, iBook G4 1.42GHz, iMac G3 Snow 700MHz, 2x iSight Mac OS X (10.4.9)

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