Was playing on cod5 when screen went pink and green. turned it off unpluged everything,set it up again turned it on and no picture at all and no sound

I had this problem...  ring ms and get the console repared  the problem is with the gpu becoming burnt out...
check out this tutorial if you can get an error code up  http://forums.xbox-scene.com/index.php?showtopic=484726

if you cant get an error code say to the people in the xbox call center you had an error code 74 as this is the code you would get for this