When I try connecting in DUN, the dialtone is not detected when I try to connect. I've checked everything. All my lines are installed correctly, I've tried two modems that work on other systems, I've tried new phone line, new modem cable, new com ports, ensured TCP/IP is installed, got the right driver. The modem installed correctly as I checked it in Control panel. When I try to connect, I get a short flurry of lights on my external modem, but then get a 630 error, no dialtone detected. I'm computer literate but I feel real stupid right now. Any ideas?