We have the same camera, we babbied that thing, didn't even really use it that much. It had a beautiful picture vibrant colors.
At first it didn't ways play or record but turning it off and on a few times would get it goin. Then the door, well first it wouldn't close, couldn't get the damn thing to stay closed, then after much careful work it stayed closed, but it's revenge was off and on would no longer make it work. One website mentioned capacators leaking or something like that.
All the ones I see in Ebay selling for a dollar seem to have the same problems.
my suggestion to open it...
A Sledge Hammer
if you haven't got one near by throwing it on the ground will achieve the same goal.
Please let me know if you have any luck