Esmoreit on 21 June 2009
Well, first of all did you tweak anything in the meantime? Did anything happen to the TV in general in the meantime? Had any storms pass over and was it on when lightening struck?
How old is the TV?
The most basic solution is also a testosteronie answer - bang it a few times with a flat hand. If that doesn't work, try tilting the set a bit. Finally, try rummagin a bit with the cables. Twist them a bit, pop them in or out, whatever. See if that changes anything.
The Doctor will see you now
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