Backup Exec 11D does not backup anything, just does endless backup scans

Greetings, all!

I've had a BE11D/Windows 2003 32 bit server with an IBM LTO5 tape drive for 3 years now. Last Fall, I stopped getting backup reports. I discovered that the server was down but brought it back online quickly. Since then, nothing has been written to tape or even backed up by the system. I see the backup scans running but that's it. I have to kill these jobs as they seem to never end. I updated the Symantec drivers for my tape drive & can inventory the tapes, but BE11D does not write to it & does not backup. I checked the credentials & tested them, all passing.

Please let me know if you see anything I have missed or haven't tried!

Thanks!

David