I have seen this happen with bad modems, usually after a power surge.
The correct troubleshooting procedure would be to connect the phone line to machine 2 only and see if the symptoms change. Turn the modem speaker on and see if you can hear a dial tone before it dials.

Jethro wrote:
>
> I have two machines - each with a dialup modem. I have them connected
> Line > Machine 2 > Machine 1 > HP AIO Printer> Telephone.
> My telephone works fine on voice.
> My AIO printer works fine sending FAX.
> My dialup on Machine 1 works fine connecting with Netzero.
> Machine 2's ControlPanel>Phone and Modem shows machine 2's modem
> properly and the diagnostic there does a successful test of the modem.
> But I can't get Machine 2 to dial Netzero. It tries the correct
> phone number, but as I listen on the phone, the dialtone is not
> interrupted as if the machine is not connected to the phone.
>
> Any suggestions as to what I can try next to make Machine 2 connect to
> Netzero? Maybe my modem is bad or not installed right? It is a 'Best
> Datafax Modem'.
>
> Both machines are WXP PRO SP2.
>
> Thanks
>
> Jethro

--
Mike Walsh
West Palm Beach, Florida, U.S.A.