Apple Macintosh Performa 577 User Manual Page 34

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  • TROUBLESHOOTING
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Troubleshooting Symptom Charts/Miscellaneous
(Continued)
- 17
Miscellaneous
(Continued)
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.
Headphone jack does
not operate correctly
1 Verify that headphone jack is seated properly.
2 Replace chassis harness assembly.
Speaker jacks do not
operate
1 Verify that speaker jacks are seated properly.
2 Replace chassis harness assembly.
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