MSL6000 Library Tape Drive slot issue.

[Scott1116]

Hello I'm having an issue with my MSL6000 tape Library it appears that I have 3 tape drive slots that appear to be dead when I put a tape drive in the fan does not turn.  The last slot slots seems to work at least the fan on the tape drive spins, but the library is not seeing the drive.  I have not been using any other slots then 0 and 1 up to this point.  I can not use the drive as it is not being seen by the library but is on my CA software.   Does anyone have any suggestions on what may be wrong with the slots and or how I can get the library to acknowledge the drive that has power.