Cable Box (Cisco) won't turn on - XFinity

Cable box (the 3rd one we've tried) won't turn on. When you plug it in, lights come on (so obviously it's getting power) and then the power indicator flashes for about 10 seconds and then it turns itself off. When you push the power switch you get nothing. Have swapped the box out 3 times and have been online chatting with the Comcast rep and nothing has worked. Help!!

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