2 TB External Drive no Longer Recognized by iMac 27"

I have a 2 TB external HD (actually two 1 TB drives housed together in a OQC Mercury Elite Case) that has been working flawlessly for about 10 months as my Time Machine backup to the iMac 27". I have it hooked via FW800.
Yesterday I noticed that TM backup failed and when playing around, I also noticed that the drive was no longer recognized. I check System Profiler and the drive was not seen. I did a PRAM reset (as this usually fixed the FW800 issues), but still no drive.
Thinking I had a faulty FW800 port on the iMac, I switched the connection to USB 2. I see the Drive listed in the USB Device Tree in System Profiler, but still nothing on Finder.
I opened Disk Utliltiy and I see a listing for a "2 TB External Raid Media" and then as a indent is says "Disk 3s3", but this is grayed out and you can not click on it to, say, repair permissions.
I installed an update late Friday night and I have no idea if this is the reason, but I am curious what the next step might be. I am using 10.6.4.

James,
There are some basics you can do to do trouble shoot the FW800 problem. First is doing a SMC reset, follow the instructions for Intel based iMacs. This letter covers multiple models of Macs and you need to follow the correct procedure.
The next item to try would be resetting the PRAM.
Finally The X Lab has written a good article on troubleshooting Firewire devices. You can locate that article here.
Hope this helps out some.
Regards,
Roger

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hello, i dont have a UPS but have it connected to a power strip
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