No signal

The concern is not "Community Knowledge Base" related............ Topic moved here to the proper help section for assistance. 

First. Check their site here for official info on any possible local outages;

https://www.xfinity.com/support/status 

Use a cell phone internet service, a public WiFi hotspot, or a neighbor's internet if you need to in order to check it.

Or you can use their Xfinity App: https://www.xfinity.com/apps