No, you should be able to right click on the loudspeaker icon, or your sound driver icon, in the notification area of the task bar, and open the sound mixer software.
Then check whether unmuting (or increasing the volume on each slider in turn) produces output from the DVD drive. That will be an analogue output signal, so something else in your sound parameters might need enabling. I can't give advice on exactly what or where, since the software provided for different sound cards varies so much. You'll have to play around with the options, or post back with some screen shots of the details.