You may have a backlight going out, which is replacable, if you can figure out how to remove the back. My old LCD only lasted 2 years; the back must have been glued on, so I donated it to goodwill and bought a new one. I had a sceptre tv and it ran pretty well; I sold it and bought a larger screen. Also be sure to check your power management settings in the control panel and the motherboard bios. Set them both back to the default settings and see if that helps.