Anyone familiar with xbox360 problems?

Hey whats up guys, I was wondering if anyone here has had this problem and can come up with a solution or maybe an explanation to why it happened? Or trouble shooting suggestions?

OK, so here is the problem.

So far the games I have tried were "Call of Duty 4" "Call of Duty World at War" and "Gears of War" all the same problem

Well when I actually try and play the games like run around and kill people the graphics SUCK. There are black lines that go threw the screen horizontally and vertically, some are thick some are thin, and they move back and forth they aren't stationary.

BUT the thing is lets say when I'm in the lobby or wile those really cool open credits go threw in the beginning of the game the picture is crystal clear. Not one line or anything.

I'm not really xbox360 incline so I have no clue honestly. But the only thing I could come up with is Graphics card. But that doesn't make sense because the graphics going threw all of the open credits in every game are clear as can be.

What I've tried so far:
- Check the wires, made sure they are secure
- Cleaned all of the disks
- Tried 2 different tv's...one tv that I always use and a brand new flat screen

BTW, there is no Red ring of death. . .yet?

 

Try beating it with a hammer?

 

I'm guessing theres a defect with your 360 or AV cords.
Try borrowing a friend's AV cords or try their 360 on your TV.
If it is your 360 or AV cords that is defected, send them to Microsoft to get them replaced.

 

All I have is a 15lb sledge. . .If it was a 30-40 pound sledge it might have worked.

But srlsy I NEED my 360 fixed!!! lol

EDIT:

Mmm, I could try that. But I've been using the cords for a long time, would the cords just go like that? I figure my 360 might.