External HD doesn't mount after 10.5.6 update!

I'm sorry to say that all was OK until.. I updated OS to 10.5.6 two days ago.. and my external 1T Seagate Freeagent Desktop for Mac stopped mounting on Firewire.
It will mount on USB, it will mount on FW when Mac is restarted, but will not when you boot up after your system was shut down.
I tried to reformat, repair the disk, repair permissions and nothing worked.
Somebody posted that you should disconnect your Firewire stuff before OS update? Is this correct?
Can anyone please suggest anything as I don't want to end up having this HD hooked with USB...
Alternatively how can I revert to the OS before the update? Is restoring from Time Machine the only solution?
Also, the following messages show up after repairing permissions:
"System/Library/Filesystems/AppleShare/afpLoad" has been modified and will not be repaired
Warning: SUID file "usr/bin/setregion" has been modified and will not be repaired
Warning: SUID file "System/Library/PrivateFrameworks/Install.framework/
Versions/A/Resources/runner" has been modified and will not be repaired
Warning: SUID file "System/Library/Printers/IOMs/LPRIOM.plugin/
Contents/MacOS/LPRIOMHelper" has been modified and will not be repaired
Should I worry about any of them?

Just to let everybody know that P-RAM reset resolved this problem.

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