I have 2 USR sportster(non winmodems) modems. One is a 33,600 and the other is a 56,000. When I go to dial the modem makes one click and gives error no dial tone. The cable between the modem and the wall is good and so is the phone line. The 56K modem worked fine until I disconnected from the internet and tried to dial back in right away. The second modem never worked. Both of these modems have been tested in other machines and work fine. Also in my computer they have the right drivers and I have verfied all of the AT commands and all are right. I have also tried a old 14,400 modem on the same line and it works fine.