Mine is aftermarket and im sure it differs from yours but ...... try (with a helper) disconnecting its power supply then while pressing the eject button re-connect the power. If that doesnt work look for a "pin hole" near the DVD drive access door. Unfold a paperclip and insert into the hole GENTLY. The hole is a DVD drive latch release access BUT it can be very easy to damage the DVD drive and or its door latch assembly by trying this. The safe way is to take it to a tech.

MyViewGS