HDMI output gone bad

We recently had an electrical storm and since that time my Apple TV (and my DVD player) will not function via the hdmi cable. I have made the connections with a known, properly functioning hdmi cable to a known, properly functioning hdmi input on my tv and also on my receiver. the Apple TV works fine when connected via the component cables or the yellow video cable. Is there a way to check the hdmi output on the apple tv via a meter or some other method and can the output be repaired/replaced.