Xbox One won't show up on HDMI in Input section

Hello! I've been playing on my Xbox for 10 months already. But one day after we got our new Xfinity Cable Box, it won't show up on my Input section anymore. Someone please help. Thanks!

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Linking xbox 360 to xbox one

This may have been discussed here before, but I am new to the board and don't see any prior discussions.

I found an article in Geek Wire that shows how to link the xbox 360 to the xbox one through the xbox one's HDMI input which is meant for the TV. This set up will allow you to play xbox 360 games through the xbox one. When you use the watch TV command the 360 plays through the xbox one's console, but this apparently sacrifices one of the xbox one's cool features... the ability to control your TV with the xbox one. Has anyone done this? Aside from being able to play the 360 games through the one's console are there other benefits? I can see the point of doing this if the TV only has one HDMI input, but with multiple HDMI inputs why not just connect the consoles independently to the TV and take advantage of all the features of the xbox one? Comments?

 

xbox one hdmi input question

will we be able to use a device like the One For All - SV 1620 Smart HDMI Switch on a xbox one hdmi input? I know that major Nelson said we could hook up our 360 to the hdmi port but if we want to hook up the cable box do we have to unhook the 360? just don't want to do the shuffle every time I want to input something different. It would be nice if the xbox one was really an all in one.