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Troubleshooting Symptom Charts/Startup - 5
Hardware failure
occurs (four-tone
error chord sequence
sounds after startup
chord)
1 Check that mylar tape on docking connector is attached and in
place.
2 Disconnect hard drive cable from logic board and reboot
system. If startup sequence is normal, power off system,
reseat cable, and retest.
3 Check for sound from spinning hard drive.
4 Replace hard drive.
5 If system is connected to any external device, disconnect
device and reboot system. If startup sequence is normal,
reseat device’s cable and retest.
6 Replace logic board.
Note:
Perform the battery contact alignment procedure when
you replace a logic board. (See Additional Procedures “Align
Battery Contacts.”)