There's something wrong with my 60. Some reason the pictures won't show, but the audio works fine. At first it showed like some reason A Scanner Darkly kind of picture. Now it won't show anything.
Have you tried using an alternate input on your TV, or a different TV? Also, try borrowing someone's A/V cables to see if there's something wrong with yours.
If you've HONESTLY tried all of those: It's safe to say that there's something wrong with your 360 video output.
Well, I'm gonna try call Microsoft tomorrow and see what the problem is. I only had my 360 for 4 months =( My xbox is still under warranty right?
Check the papers that came with your 360? Or when you call Microsoft ask if you're still under warranty.