Dvd player is recognized but cannot rea...

Hi,  my computer is a Acer Extensa 5620-6747.  Last friday afternoon I was checking a movie and everything was fine.  Friday night, the dvd player stopped working.  The dvd player is detected by the computer and the driver is correctly installed.  But when I try to play a music cd, a data dvd, a movie or a game the pc doesn't detect it.  When I click on the player Icon in ''my computer'' it asks me to insert a dvd and the door of the player opens.