Sometimes it switches itself off and im unable to switch it back on for ages. When i put it on it makes a high pitch humming noise, no picture and eventually goes into standby. I have to keep trying to put it on, i wait for the fan at the back to stop, unplug it and then start the process of switching it on until i eventually get a picture then switch it off untill it runs without turning itself off - it's almost as though its dropped a setting and needs some help to put it right...this is the third time this year its happened. Please, does anyone know what could be wrong and how I can fix it???
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