Currently using AT&T DSL service at our farm.  Motorola modem.  Pretty sure I need to replace the modem as the Internet light will not light up.  This happened about a year ago and they sent me another one.  Do I have to get my modem from At&T or can I just go to Best Buy and get one, even another brand?  Is there programming that needs to be done or just plug it in?

Thanks,