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Problem with my Hitachi 55HDT52 Plasma - won't come on

When using the remote or power on the set, the green light comes on and blinks about 10-11 times, then nothing. I hear a click when I tuen it on or off, but no picture or sound. I can not navigate the menu or inputs.
Although the green light is on, it doe not appear that the scree is actually powered. any suggestion??

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