if a cable is unplugged thats 4 red rings. (av cable)

for 1 thing
THINGS TO TRY
Try the following to resolve the problem:
1. Turn off your Xbox 360 console, disconnect and reconnect all cables, and then turn your Xbox 360 console back on. If this step doesn't resolve the problem, try step 2.
2. Turn off the console, and then disconnect any connected accessories, such as controllers, Xbox 360 memory units, and the Xbox 360 hard disk. With these accessories removed, restart the console to see whether the problem persists and to pinpoint whether it is the console or an accessory. If this step doesn't resolve the problem, try step 3.