A few years ago my OPPO BD 105 CD drawer would not open and this is the reply that I recieved from customer service:
Remove all cables from back of player
Change the dip switch on the back of the player from 115V to 230V
Press and hold power button for 5 seconds. Release
Change the dip switch on the back of the player from 230V to 115V
Reconnect power cord. Press power switch
After these procedures my CD drawer worked properly