XBox 360 help plz

[Hero_Of_Time]

Ok, for some reason our cable went out and I thought it'd not effect my 360 but it did. It turns on but won't show on the TV. It just shows the program for the channel. I tried flipping the switch on the cord in back from 'TV' to 'HD' then back but nothing. It didn't show on HD or TV. Everything is plugged in also. I put in the right cords (red, white, and yellow ones) but still nothing. It was working fine yesterday.