Won't mount external HD

My MBP suddenly is no longer mounting my external HD's. Both will mount on my G4 desktop and my old PowerBook G4 and will mount on Windows machines as well. So I know the drives and the connecting cables are ok.
Both drives are receiving power from both USB ports and the FW800 port (neither drive has a FW400 port) so at least power is getting to the ports on the MBP.
My best guess right now is some type of corrupted preference file, but I have no idea which preference file it might be and I don't want to start trashing preference files.
This message is repeated 100s of times in my system.log:
May 2 17:04:12 adwMacBookPro kernel[0]: ERROR: FireWire (OHCI) TI ID 8025 built-in: handleUnrecoverableErrorInt
May 2 17:04:15 adwMacBookPro kernel[0]: FireWire GUID 1019e3fffe1b6e30 is invalid!
Any ideas?
Thanks
Anthony

Already repaired permissions and zapped PRAM. Also ran cron jobs and cleared caches.
Am trying to startup from Hardware Diagnostics disk, but now I'm even having startup issues. This is starting to look more and more like a hardware problem.

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    I have a 5-yr-old G5 networked to a new iMac. I have had a 1-TB external HD attached via Firewire 400 to the G5 for about a year. Yesterday it didn't show up on the G5 desktop. I went to this forum, searched under "disc won't mount", got some ideas, ran DiskWarrior and Disk Utility...but nothing worked. They all said the disc was fine, directories rebuilt, etc., but it wouldn't mount. This AM it occurred to me that I had the correct cable, so I tried plugging it into the iMac instead. It worked. The data is safe, the disc shows up, everything seems to be OK, but it won't mount to the G5. Why would that happen, and how can I mount it to the G5? And how likely is the disc to remain accessible?

    May I hop onto your thread as I have a similar problem.
    I have a 5 year old G5 PMac with 10.5 onto which I have daisy chained two UltraMax 1TB firewire 800 drives. For the last 5 years I have been able, even with out sharing enabled, to connect to the G5 from a G4 Graphite with 10.4, a G4 Powerbook with 10.5 and now a MbP with 10.6.
    After completing the login dialogue in the past from any other mac it would give me a list of the G5, it's Hard disk, user directories and the two Firewire Drives. On selecting them the drive would mount onto the desktop as a network drive. This went well until monday when it became temperamental in the morning and after a few restarts and one successful mount it has not shown up since. If I come to the G5 via the Go > Connect to Server I get a dialogue "Could Not connect to the server because the name or password are incorrect". If I try to connect via the network icon in the side window of the finder window I get a network dialogue log in, I get a list of folders and drives but then when selecting the FH drive get an error message which relates to the alias to the G5 Server requiring deleting or fixing.
    Originally it just connected without any messing but now unless i make the firewire drive a shared drive the process on the other macs cannot see the firewire drive. NOTE - After having made the internal boot HD of the G5 shared, I can now see and mount this drive from the other macs but not the external drive.
    This is causing me to pull my hair out, I have run disk utility, powered down unconnected and reconnected everything .The HD's appear to be working ok from the G5.
    I urgently need to connect the FW drive to my G4 to do some work but it also needs to be connected to the G5, has anyone got a clue why I cant get G4 (or any other mac) to mount G5's external FW drive

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