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Troubleshooting Symptom Charts/Miscellaneous - 26
Screen shows “Sad
Macintosh” icon and
black vertical lines;
screeching sound
1 Replace RAM SIMMs on logic board.
2 Replace logic board. Retain customer’s SIMMs.
Rattling sound at
startup in system
with Apple External
Video Connector
Press or fold Apple External Video cable to prevent it from
contacting fan blades.
Headphone jack does
not operate correctly
1 Verify that headphone jack is seated properly.
2 Replace front panel control board.
3 Replace chassis/wiring harness.