The internet box

Because I have test the modem and my devices and the modem comes on blinking then turns green then shuts off completely 

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

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 

@user_w5zco1 

Thank you for reaching out. We apologize for any inconvenience and hope the information provided by @user_w5zco1 helped restore your connection or schedule a technician to resolve the issue.