Cannot mount any firewire/USB external drive after software update 10.5.4

After the last software update on 10.5.4 it did not complete the installation, and get stuck at the last step of running installation script for hours. So I have to restart the computer, and it restarted fine. Then I use Disk Utility to check my hard disk, and discovered some file system inconsistency error, so I repaired it (in target disk mode by another Mac). After it is repaired, the file system passed with no error.
But ever since then, I cannot mount any external firewire drive or USB drive. I cannot use Time Machine to backup my disk. I think my firewire and USB ports are fine because I can restart my iMac in target mode and connect to my MacBook via firewire, so the hardwire ports are functional, except that it seems 10.5.4 cannot detect or mount any external drive after the failed software update.
Does anyone encounter similar problem? How can I fix it? I have my disk backed up by TimeMachine but I cannot restore it if it won't let me mount my TimeMachine disk. Is there any other way other than completely reinstall 10.5 from scratch?

first, you should try reinstalling 10.5.4. download the [combo update|http://www.apple.com/downloads/macosx/apple/macosx_updates/macosx1054com boupdate.html] and run it. If that doesn't fix the issue, you can use full system restore from TM to go back to a time before the troubles started. to do that boot from the leopard install dvd, once past the language screen go to the Utilities menu at the top and choose "restore from backup".

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Cannot mount any firewire/USB external drive after software update 10.5.4

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