It sounds like it is stripped and you have a few options.
1. Try to pry the door out anyway with the screw in there. Chances are with the stripped threads on the screw, it will come out and you can push the screw out from the back.
2. Try to use an easy out tool if you can find one small enough.
3. Drill it out carefully
4. Grind it out with a dremel.
5. Use a left handed drill bit to help it out.
Option 3, 4 and 5 will require to find an alternative to refastening when you are done.
Good Luck,
Frank
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Thanks, everyone. Pags, that's exactly what happened. The screw was out as far as it would go (barely noticeable) but the door was still snug in its opening. When I noticed a tiny bit of play in the door I managed to pop it out. The new memory has been running fine for about two months now.
crwdns2934271:0crwdnd2934271:0 Tom crwdne2934271:0