"Nothing" is appearing on your screen using composite? just to cover bases, are you switching to the correct input on your TV - often something like "video 1"??
If you're confident you're on the right input for composite and have no image, you could try a hard reset (this will put the box back to factory defaults too). Remove all cables except the power cord - press and hold the reset button for 30+ seconds - while still holding in the reset, pull the power cord. Then reconnect everything and see what you get (I would initially try composite again).