Belong to a fraternal organization that donated a JVC 52" rear projection TV to a charitable organization in Nov. 2006. Has worked fine since then. Now it has a problem. Turn it on and the screen remains black while the blue Power light flashes. Model HD-52G886. Manufactured In Aug. 2005. S/N 13080377 AA Purchased from Sears. Any ideas on what's wrong? Also, might it still be under warranty? They can't find the paperwork we left them.

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