My Samsung 42 inch plasma, the screen has gone black and a loud buzzing noise...

...is coming from it.? My Samsung 42 inch plasma, the screen has gone black and a loud buzzing noise is coming from it. I rarely watch this tv, its a 1 1/2 years old. Ive tried everything unplugging and redoing it to cable boxes and different power surge etc. Can anyone help?! Thanks!
 
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