Power Cord connection loose, goes on and off when moved

Ooh, you might be out of luck here. If you don't know how to solder, you'd be better off buying a new one.

If you DO know how to solder, the problem is likely the solder connection between the socket pins and the board. Resolder those joints, and you should be good to go. To open it, look for screws. Sometimes, screws are hidden in inconspicuous places, like under small adhesive pads or under labels.

Good luck.