I'm paying COMCAST for the service, therefore my issue must be covered by their support: I understand where you're coming from. The last thing that I want you to do is spend money when it's not necessary. I am not aware what COMCAST representative told you but basically if I know its COMCAST service capacity then I'll immediately refer you back to them. However as I have stated earlier their service is limited to ensuring that you have an active internet signal up to your modem. They act like our electricity provider, whose only responsibility is to ensure continuous distribution of electricity to our homes. But normally, they don't support any issue related to malfunctioning electrical devices for whatever reason.you And just as in your case, your internet signal is working fine, but the device that you try to connect into it isn't. If you'd let me I'd like to get this issue resolve for you in approximately 30 minutes. Shall we proceed?