I have a Philips 27PT543S37A with chassis number L01-1UAC-7638. As of recently, when I turn the television on, the green power indicator light comes on at the front, but I get no picture or sound. I don't get any sign that the television is even trying to acquire picture or sound for the television. The picture had been collapsing and re-opening on me for a few days, but it would always fix itself. Any one have any clue of this is a simple fix and how I can go about getting it to work again. I would really appreciate the help.