My TV went off the other TVS are working fine there is no outage

when turning on the tv it says welcome and will not do anything.  the box says boot

Hey @user_ruo3ql, Thank you for visiting our official Xfinity Forums Community support page. We greatly appreciate you taking the time to share your experience regarding the Xfinity Video X1 Set-top Box. I would be more than happy to offer my assistance looking into this further for you.

Typically, when the set-top box is rebooting and gets stuck on the "Welcome Screen", that can indicate a possible issue with the cable signal communication with the set-top box. 

With the symptoms you're receiving with the Xfinity Video services, would you be able to check the following: 
 
 -> Check the coax cable going to the back of your set-top box to ensure there's a tight connection. Loose connections can cause signal loss or introduce noise into the line.
 
 -> Check the connections of the coax cable to any splitters within your home. Like at the back of your box, loose connections here can cause signal loss or introduce noise into the line.
 
 -> Check the coax cable to ensure it is in good quality such as no hard bends, kinks, bite marks, or cuts that could interfere with signal reaching the set-top box.
 
Please give these items a check and let us know if anything happened to be loose, not connected properly, or if you had to fix the cable line.