Magnavox MPD850 will not charge?

This question was posted recently but has not yeilded an answer that works for me. Here's the previous post:

http://www.howtomendit.com/answers.php?id=79899

I am having a simlar problem. I haven't used the DVD player in a few months and it has been stored OFF. I plugged it in to charge (also OFF) a few hours ago and when I unplugged it and turned it on to check the progress... I got zilch, nothing, no response. I plugged it back in and turned it ON again and it works fine with AC power but the battery seems to do nothing. Any ideas?