Vizio p42 type sp42a nov 2004 hd tv. When trying to turn set on power button is amber and turns

Question

When trying to turn set on power button is amber and turns to green Screen will not do anything

POWER INDICATING LIGHT GOES FROM AMBER TO GREEN WHEN TURNED ON. AUDIO YES, BUT NO SCREEN- TRIED WITH A DVD SIGNAL- STILL NOTHING, NOT EVEN MENU SELECTION SHOWS ON THE SCREEN. BOUGHT SET IN LATE 2006 AND WORKED FINE UNTIL MAY 11, 2008