Question about Philips Magnavox 27MS343S 27" TV

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Magnavox 42mf231d/17 Plasma

This problem started a few mouths ago .I did not know the kids had to smack the back of the T V for the picture to come on , well now the tv has no picture or sound but the blue power light is on This tv is only 2 years old . Any idea { other than smacking a tv is not smart } what could be wrong ? Thank You

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