Sony plasma model PFM42V1 just clicks and buzzes
 

The customer got this set used about one year ago. He said that for
the first four months it worked fine. For six months after that it
still worked fine but he says that he was aware of a "humming" noise
coming the right rear of the set (looking from behind). Now when you
plug it in the red front panel standby light comes on and when power
up is attempted the set clicks and the green light comes on and then
a few seconds later there is a buuzzing noise that comes from the
right rear area of the set. It does not power up though. This is my
first plasma so any assistance anyone might offer would be most
sincerely appreciated. Thanks, Lenny Stein, Barlen Electronics.