The cable statement doesn't tell much as many TVs blank the screen on no signal.
My Samsung tv has green "static" type lines going through it. Even when the cable is disconnected it still happens. Never done it b4 but now it won't stop, and it was going off and on by itself. Any clues?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic