Apple Tv Won't Work!?

i have an apple tv i got today and i got the HDMI cable and i plugged everything in and it doesn't work i've tried unplugging rebooting plugging everything in tight and checked all the inputs! everything fits in well to! fo you think the HDMI cable is wrong? HELP!
Update: i have tried re-plugging and stuff all it says in the apple tv manual. i have a HDMI cord by AUVIO.
Update 2: @AVDADDY ^^^^^^^
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