jvc av48p575

I recently bought a jvc av48p575 from a friend (out of waranty now) and everything is great. I purchased a high def directv box to take full advantage of the 1080i and go ahead and hook it up to my hdmi port on the tv and get no picture, sound or anything. I've tried different res modes, changed cords, and even hooked up a friends dvd player with an hdmi port on it as well to test and that didn't work either as in the tv displays no picture, or sound on the digital in input. I've been reading that these hdmi ports are light sensitive??? (spent a lot of time back there with a bright light hooking things up). I've gone to the service menu to try the "fix" (system check, turn off tv after fans stop ect...) but my menu options are different and I don't have a "system check" feature to reset the hdmi port. I would appreciate any advise on my situation. Thanks

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