I have a 27' Panasonic Tau that will not turn on. When you attempt to turn it on with the power switch or the remote, you hear an initial click, then you hear the tube hum and then there is another click, then nothing. I do not think it is the picture tube as the picture was perfect prior to this occuring. Additionally it did this before and then suddenyl began working as though nothing was wrong for a period before reverting back to the current condition. Any ideas as to what might be wrong?