Apple Mac PowerBook 550c - Manual (Page 50)

Troubleshooting Symptom Charts/Internal Modem
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Internal Modem
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Strange mix of
characters appears on
screen
1 Verify that baud rate and data format settings of
communications application are compatible with internal
modem and remote modem.
2 Check phone cord connection and operation.
3 Verify that System is 7.1.1 or later.
4 Reseat modem card.
5 Replace modem card.
6 Replace daughterboard.
7 Replace motherboard.
Modem interferes
with system sound
1 Reseat modem card.
2 Replace modem card.
3 Replace interconnect board.
4 Replace motherboard.