You have probably already done this, but make sure it didn't somehow get locked in the BIOS. It's worth checking.
Beyond that, any possibility of doing a system restore back to before the failure? Of course, it's possible that the hardware itself has failed, in which case it needs replacement. But a restore might help diagnose whether it's just the software that's gotten messed up.
Another thing you could try, if you have another laptop or a helpful friend with one, is to pop another drive in there. (They are all pretty much PnP SATA devices now, and held in place by just one or two easily-accessible screws, so it's easy to do.) If it installs and works immediately, that could point to hardware failure with your BD drive.
