Modem does not respond can hear dial tone

  1. Check that the correct modem is selected in the Network Port Configuration section of the Network system preferences.
  2. Check that the modem application is properly configured.
  3. Open Apple System Profiler, and under the Software tab look at Extensions. Check to see that the MotorolaSM56K and AppleI2SModem Family files are listed and loaded. If not, restart the system and check again. If still not visible, replace system software.
  4. Open Apple System Profiler, and look for Apple External Modem in the USB Device Tree under the Hardware tab. If it does not appear, check the modem USB connection.
  5. Replace the Apple USB Modem.
  6. Replace the logic board.
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