The door will open, but only if I help it along.. If not it makes a terrible noise, and just sits there . Like it's stripped. But if I unhook the door, the bracket goes up and down, just fine. The weight of the door, seems to be to heavy all of a suden.

It sounds like the door spring is broken. See this site (http://www.factsfacts.com/MyHomeRepair/springs.htm) for some good info.

Be careful!
WallyH