I have a poloroid 46" LCD that's about 4 years old... Recently the display started randomly going out on me.. The display and sound randomly go out, the power light remains on, and the menu still works. I just turn it off, when I turn it back on everything is fine, until it goes out again. Sometimes it might not go out for hours, and other times it happens quite frequently. This happens on both of the hdmi inputs, sometimes when playing video games, and sometimes when watching tv.. Any ideas??