LaCie D2 Firewire 800 drives not mounting.

Hi guys,
After an OS upgrade to 10.5 I can't mount any Firewire drives to desktop. In fact, they're not even listed in System profiler, the message "*Warning:Unable to list FireWire devices*" comes up in Firewire bus section.
They worked fine under 10.4 etc, and still mount on older G4 towers all running Tiger/Panther
Any help appreciated.
System: MacBook, OS X 10.5, LaCie D2 FW800 external drives

Not likely a problem with your LaCie drives, but something related to the FireWire drivers inside your upgraded OS X 10.5 installation.
From your own words, system profiler is reporting that it is unable to list any FireWire devices.
You may want to try resetting your FireWIre bus as a first step:
shutdown your computer, and disconnect drives
remove AC power from your drives as well as your computer for a few minutes; with laptops, also remove the battery
reconnect AC to just your computer; reinstall battery if a laptop
restart computer; confirm that there is no problem in the FireWire section of your Apple System Profiler report
connect power to your FireWire drive, and reconnect to the computer. Confirm that drive is visible to both Apple System Profiler as well as Apple Disk Utility. Apply First Aid to confirm drive is OK.
If drive does not appear, or there is a problem reported with the FireWire bus, then suspect a fauly installation of OS X. Youc an boot from your Leopard OS X DVD, and use Apple Disk Utility and Apple System Profiler while booed from the DVD. This will be a clean version of the OS, and probably overcome any problems with the installed OS X.
If drive appears fine while booted from the DVD, then you will need to reinstall your OS X.
Mike

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