Tech Problem

I have this antique 400-DVD carousel player, the kind they don't make no more. It's the Sony DVP-CX995V.

It worked great until the other day when I tried to program it. I dunno what I did but it locked up and none of the controls work. I unplugged it, waited, plugged it back in and now I get a "Please Wait" message and still none of the controls work. I tried holding down the Power button when I plugged it back in and it didn't make any difference. Does anyone have any idea how to unfreeze it, do a factory reset or just get my DVDs out of it without dismantling the whole thing?