[zcaveman]

You can go to Best Buy or anywhere and buy a modem. When you plug it in, you will get a screen to lead you through a process to register it. I never could get it to work. you can just call Comcast and they will activate it from their end. You can then take your old modem down to the local store and turn it in. Be sure to bring a bill so they can see you are renting that modem. If you happen to still have the receipt with the modem number on it bring it. It can't hurt.