Do visual inspection, try prying the cover open without force.
try putting can of air threw the door opening of the unit.

this can be many things
the switch for the draw it self
the computer that runs the system
it could be jammed
the dvd stuck in the machine and the 5-disc holder
with the unit off put your noise where air goes threw the equipment and smell to see if you smell something has burned smell, if you like something has burn the circuit than the unit need to be repaired.

is the unit have any type of Warrant with it.
if not just take it apart and play with it and maybe you mite fix it or
give to kid or friend that play with electronic stuff, they would fix it for free.
it is may not be worth fixing, call around for labor cost, parts.
than go look online or walmart or price check on the item you want and than deside if it is worth fixing

good luck rod