are you getting any picture at all from ur 360?
make sure that ur the HDMI from ur H/K to ur TV is connected where it says HDMI out and the hdmi from xbox to ur H/K is in HDMI IN, plug it in2 HDMI 1.
also play with ur receiver a bit, using the remote change sources until you see the xbox menu and if u see the xbox menu play a game or something and if there is no sound well then u have hooked up ur speakers the wrong way. i had a 247 and 354 and i remember the first time i hooked em up there was always something done wrong.
dont get me wrong H/K ROCKSSSS. great receiver.