80 yr old lady who cannot afford high speed connection. Needs dial-up to communicate for medical & therapy care. Decent, but old Gateway 1.2 Ghz Gateway 300S WXPH cannot connect because dial-up number cannot be entered.. All other systems work. Modem detects, works in other machines. Gateway does not work on any phone line at any house, but modem works in other Gateway. All other devices work well. When access Control panel->Internet properties->Connections->Setup->Connection wizard->Connect to Internet->Setup connection manually or use disk, "connect using modem" is greyed out so cannot enter telephone number. Modem tests fine in device manager. All other choices show "working properly." Ethernet works fine but she cannot afford any high speed connection. Diagnostics report every aspect working well. All systems tested in another Gateway where they work well. Telephony shows up as manual in Services (local) in Console Root and no errors or warning elsewere in console root. It is a motherboard issue, we presume, because replacing with a variety of modems makes no difference. What am I missing? It has been so long since I connected somebody to dial-up, that I could have made basic error. I do not recall ever seeing this problem. We are doing the work gratis as she is unable to pay or buy another system. It appears we will buy her motherboard unless somebody wiser and more experienced has some good guesses.