Oh dear. Exactly the same thing happened to me, all I can say is it seems like my printer isn't closing properly like a catch has snapped. The top part is really loose but I'm not sure if it's always been like this! It's really bugging me though, I can't print a thing and I've tried turning it off and closing it a million times to. Happened when I tried to change my ink too.
Sorry I couldn't be of help but your not the only one with this problem.
Amy
May 2008