mitsubishi 65869

power outage played hell on my TV. Was workin fine power went out and now the thing does what it wants. if you turn on with remote or manually it says power loss at bottom, andstays on for a minute or so and then powers off...green light flashes for 90 seconds then stays off... sometime it will stay on and work for days then starts to act up again. Really confused as the TV worked amazing prior to power outage...any help would be awesome