Chances are, if your internet is not working on your computer, then it is probably because of problems at the Comcast server. The Comcast server provides the connection between us and other servers like Google and Facebook. When the Comcast server is down, no matter what you try, it won't work on your computer. In this case, you can visit xfinity.com or use third-party tools to check the status of the Comcast server. Since the internet is not working on your computer, you can check the status of the Comcast server on some other device like your phone.