If this has worked in the past (and so you know how it all works and are familiar with it), and now it doesn't then the first thing I would try would be a 'soft' reset, usually done by holding down the power button on the remote until the TV reboots.
If that doesn't work then I would try deregistering and registering the drive and try again.
If still no good then try a full factory reset of the TV (always the last option although many seem to suggest it as a first step) and see if the drive can be set up and if it works OK.
