CANNOT OPEN PLAYER
To open the drawer, unplug the unit while the power is on (so that the drawer doesn't try to open on its own). Keeping the unit flat on a table, look underneath and find the small hole where you can turn the loading gear. Rotate it until the unit opens, using a standard flat screwdriver. The loading gear is a white plastic part with a slot in it. You should be able to see it rotate if you move the drawer by hand.
After manually removing the disc, turn the gear with your screwdriver until the drawer is all the way in, The gear should be able to be turned for three or four more turns when the drawer stops loading. If it doesn't, turn it a bit further unit it "pops" past one more gear notch. It should then turn freely for a few more turns, at this point you should stop. Do not force it once it stops the second time. This is the "Disc Loaded" position.
Power the unit back up and see if it loads a disc and plays correctly.