Internal modem will not connect

Hi,
I have just purchased a used iMac G5 1.6 Ghz and am having problems getting the modem to connect.
I installed the original version of OSX 10.3.5 and the internal modem would not even show up in the Network pane. I tried doing the install twice and both times got the same result.
I tried upgrading to 10.3.9 using the MacOSXUpdateCombo10.3.9. and after the iMac restarted and I opened the Network pane I got a message that a new port had been detected "Internal modem" and to check the settings and click "Apply Now". I did that and was then able to enter my ISP settings for the Internal modem. When I open Internet Connect the settings are all correct, but when I try to Connect the modem says it is "Connecting", but I don't hear any dial tone or dialling and after a few seconds it says "Disconnecting" and will continue to do so until I restart the computer.
Is it possible that the modem is dead and is there any way for me to do a hardware diagnostic to make sure? When I run the Apple Hardware test it just shows "Device found" beside the modem.
Any help or suggestions would be greatly appreciated as we live in a rural area and a high speed modem is not even an option.
Thanks,
Richard

Welcome to the discussions.
Try sending a fax (via the print dialog) to a friend.
If that works, then the problem is not your hardware.
Thanks Barbara for replying to my problem.
I tried what you had suggested about sending a fax via the Print dialog and when I look at the Internal Modem window it just says "Preparing fax" and will stay like that until I click on "Stop Jobs". No dialtone, no dialing out, nothing.
Since I sent the message I have also tried creating a new network location in the Network pane using the Network Setup Assistant and I get as far as a dialog which says "Gathering modem information" that will stay that like that until I quit the Setup Assistant.
I have also had a look at the system logs in Console and I see this particular line whenever I try to connect with the internal modem:
localhost kernel: AppleI2SModemfamily::SSIStartUP -- SSIStartUP3034 two sync mode is UNSUCCESSFUL after 20 tries!
Does this mean that it looks like the modem is definitely dead? Is there no diagnostic tool that will tell me for sure whether the modem is actually dead, before I take it in to a service tech?
Thanks again,
Richard

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