I live in the Seattle area and have COMCAST for my internet provider. (I have no other choice.) I recently tried to sign up for HBO GO and had difficulty on the HBOGO site.  I called Apple for help since they are by far the most helpful of the three corporations and I was told that COMCAST may not be a  provider.  I had noticed people reporting similar problems with COMCAST and  other internet TV providers. Does anyone have any insight into the COMCAST snafu with Apple...