My Panasonic plasma tv is approx. 4 - 5 years old. today when I turned it on

it started blinking & flashing? is it toast or is there something I can do to stop it?
The actual screen is blinking between green and the picture. Usually only half the screen turns green. It varies between where on the screen this happens. It occurs approx. every 4 - 5 seconds, and only lasts for a second or two. But it makes the tv unwatchable.
 
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