Hitachi 50V500 50 in. HD-Ready LCD Television "cause bouncing tv picture" Questions

...Now I try to turn the tv on and i hear a click but no picture or sound comes on and the red light is not on. Is this a lost cause or can it be fixed. Research at www.HitachiServiceUSA.com

...picture returns. Can you tell me what might be causing this? I have replaced the cable, and it still happens, by the way. Thanks. I have not repaired this brand of TV. I would say my first hand of ...