its weird that you got the same , non common problem. Could it be something to do with the setup, is the av cable near a heater or something? have you tried it with a different tv? when you turn on the xbox does it sound like its working and its just not outputting the signal?
If you unplug the av cable from the back of the xbox, you will get 3 red lights, so that would suggest that its the other end of the cable (connected to the tv). Can you borrow an xbox av cable from a friend to see if its just the cable that broken.
don't forget you have warranty
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