Very first thing that I would check would be the connection both to the drive and to the board - and even going so far as changing out the cable - then start looking for other things-eh!!
btw - getting to the VERY DELICATE laser involves taking the drive apart - and if you don't know what you are doing - then don't attempt it.
Also - DO NOT use one of those laser cleaning discs - unless you want to risk really messing up your drive too
Also make sure that the drive is recognized in the Control Panel's Device Manager.