I had run across this problem earlier this week. When returned to the client, the system flat out wouldn't see the ATT modem. No matter what I did, it refused to proceed further even after using the ATT-SST(self-support tool) s/w, it also didn't see the modem. Calling ATT only got the customer help in that they were too busy with current clients, call back later. I finally did a complete reload of the OS and pgms. to include the ATT stuff. What was different, was the registration of the modem and customer info in order to complete the install. Once that was done, it acted as its suppose to. The modem info is the decal of the S/N# for that modem and customer details which weren't asked when the system was up and running before. Doing all this got the system to proceed. While, I can't be sure, it maybe an outside issue with ATT having to supply this info and maybe why they were so busy. Their database may have been corrupted or compromised as the required links couldn't be reached and broadband was denied. It seemed strange unable to get support which wasn't a problem in the past.
If, during the reload of the system, it didn't ask for such ATT info, then then hopefully that's the crux of your problem. I exclude any true modem damage, which does happen. Use the disc supplied when the modem was shipped to install or get your SST pgm. from ATT support website. You will need to know password and client ID, etc. in order to be 100% install.
AT&T Yahoo! High Speed Internet Installer is unable to detect your modem.
So my computer has been wiped out and that stuff so i am trying to install internet in my computer again. But everytime i get the ATT yahoo unable to detect modem with the yahoo high speed internet disk. I use a motorola modem style MSTATEA and a Netgear router WGR614 v9 for the internet. Everything is connected properly and the green lights are everywhere they should be but i just can't seem to find the problem. It also says No Modem Found which i have no idea why they aren't able to. On the installer it says:
No Modem Found
AT&T Yahoo! High Speed Internet is unable to detect your modem.
1) Make sure that your modem is turned on (the button on the back of the modem should be pressed in).
2) Insure that the yellow Ethernet cable is connected from the yellow port on the back of the modem to the Ethernet port on your computer.
Please select Help<-(bold) to see how your modem should be connected, or Retry<-(bold) to try and detect the modem again immediately. I have triple checked and everything and 1) and 2) is in and everything. So i still can't find the problem and always get the same No modem found. Please help.