I have A Pioneer SDT50W1 rear projection TV which is about 11 years old. It is in A1 condition but recently I have had a problem when turning on the set. When I press the on off switch on the front of the set it clicks on with a green light showing but then immediately clicks off showing a red light as if going into standby mode. ( I have tried then turning the set on from the remote handset but nothing happens). The set only does this on some occassions. I had the set on for most of the day a week ago turning on and off through the day. The next morning tried to turn on the set but immediately clicked off. Tried several times that day but same response. After leaving a few days TV all ok again. This has been happening over the last 3 month or so. Any ideas? it's driving me mad.