Our HDMI inputs are. Ot working on our TV,we tried all four and nothing.

Have you tried using a different device to test the ports?

Are you sure that while you test the ports, you are on the correct input on the television?

Do any of the other inputs work ex. Analogue, composite, RGB, VGA, etc?

Have you tried unplugging the television for half an hour or so and then powering back on?