i was playing my 360 and the picture suddenly became distorted so i turned off the TV and the 360 and checked the cables at the back when i tried to turn it back on it the xbox would make its normal noises and no red rings appeared but the screen stayed on the AV screen.

for about 10mins i fiddled with the cables and got it to work again but this only lasted a couple of mins and again when i try to turn the xbox on the console makes all the normal noises, no red rings appear but the screen stays on the AV screen

what is wrong??