Help needed.

Alright guys, so I was playing Halo 3 yesterday and everything was running fine and smooth with my xbox. I turned it on again last night and no picture comes up on my TV. I hear the sound and everything is hooked up correctly but still...no picture. There weren't any problems before last night so could anyone tell me what's wrong? Do I need to get a new AV cable? Is my xbox broken? If so, where can I fix it? I live in the U.S. so if it needs fixing could gamestop fix it?

Have you tried a different TV? or different input on your TV? Hard to believe the cables would just go bad but who knows.

Yea I was on a 28" and I moved it to a 42" and tried all the different cable inserts on that TV and it still didn't work.

Yea, I'll try that. I had this topic in a different forum and I also typed the problem in google and people said that my video card was broken and it was a problem with my console.