Hello, I have a Philips LCD TV 46PFL7505D. I had it mounted on a wall, but today I moved so I had to take it down. Around 7 or 8 hours later I tried to connect my tv and there is no picture. Sound is fine, can change channels and ect. Just no picture, the screen is black as if off. But when I change channels or mess around with the remote, the screen flashes bright. Can somebody please aim me in the right direction. Thanks