It won't my tv says no signal I have the HDMI plugged in to the TV and Xbox I just got this thing it worked on my other tv it doesn't look broken I'm at my dad's and I'm using a different TV
Try another hdmi tv port or another hdmi cable. Test another device with hdmi cable, that way you'll see if xbox, cable or tv is faulty. Also check if the channel you choosed is the same where the cable is plugged, hdmi 1, hdmi 2 etc.