I agree with Tim931. RCAs and Magnavox 52 and 55 inch rear projection tvs have a speaker switch on the back of them. Flip the switch to on. My neighbor had the same issue with the same tv. Good luck.
one thing to check is to see if your model has a speaker swith on the rear panel and see that it didnt get bumped to off
other wise check speakers in the menu to see if there turned off
if not there then you will have to trouble shoot the small signal board
tv wont turn on the green light comes on for a second or two then goes off then comes back on and...
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tv wont turn on the green light comes on for a second or two then goes off then comes back on and does this 3 times