Unable to detect tape drive or tape media.

[towery]

I am using a Dell Poweredge SC420 with Small Business Server 2003. The tape backup unit is a Travan TR-40. I have searched everywhere for a fix for this problem. The backup server has worked fine for years, now all of a sudden when I put a tape in, it is automatically ejected. I have tried, hotfixes, cleaned the machine, tried 2 different new tapes, but when I put the tape in it whirls for 30 seconds and ejects it.
Here is what the backup log says:

0/2010 4:09PM
-------------------------------
Date: 09/20/2010
Time: 4:09 PM
User: administrator
-------------------------------

Backup Runner started.
NTMS session started successfully.
EnumerateNtmsObject(NTMS_LIBRARY) succeeded.
Will enumerate on 3 media libraries found.
GetNtmsObjectInformation(NtmsLibraryInfo) succeeded.
GetNtmsObjectInformation(NtmsLibraryInfo) succeeded.
Found an enabled library.
InventoryNtmsLibrary(NtmsInventoryOmid) succeeded.
Identify Media completed
EnumerateNtmsObject(NTMS_PHYSICAL_MEDIA) succeeded.
Will enumerate on 0 media types found.
GetNtmsObjectInformation(NtmsLibraryInfo) succeeded.
Found an enabled library.
InventoryNtmsLibrary(NtmsInventoryOmid) succeeded.
Identify Media completed
EnumerateNtmsObject(NTMS_PHYSICAL_MEDIA) succeeded.
Will enumerate on 0 media types found.
Unable to detect tape drive or tape media.
GetTapeMediaPoolName failed. (0x80070458)
GetBackupDestination failed. (0x80070458)
LaunchNTBackup failed. (0x80070458)
NTBackup finished the backup with errors.

For more information about failed backups, see the article on
troubleshooting your backup at the following Web page:
http://go.microsoft.com/fwlink/?LinkId=18414

Backup ended at Monday, September 20, 2010 4:09PM
Backup error finished with error code 0X80070458.

This is so frustrating! Please help!

[Jerry]

You should try to power off and on the server and disconnect and reconnect cable from the tape drive and then power on it again. Other than this you can check for new tape device drivers as of Dell? Otherwise, by some possibility did you try to install latest tape device drivers through WU/MU? So try this out and check if it resolves the problem for you. Good Luck!!!