Hi,
Please perform the following steps:
1) rightclick on the device
2) disable the device
3) delete the device by rightclicking on the library
4) restart all the Backup Exec Services
5) Run the device configuration wizard and configure the device.
Also, refer to the following documents:
* How to troubleshoot issues with a Robotic Library or Tape Drive in Backup Exec 9.x and 10.0
http://support.veritas.com/docs/255501
* How to resolve hardware communication/detection issues with Backup Exec
http://support.veritas.com/docs/237047
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