i have a mitsubishi 60 in it will not stay on,some days its fine some days its bad. it turns off a amber light blinks some times for 2 or 3m and sometimes for over a hour. when it stops blinking i turn on the tv,sometimes its works fine but most of the time the screen will not turn on but the sound is on then the tv will turn blue the turn off right away. i have unplugged it.moved it dusted but nothing works! what should i do?