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Troubleshooting Symptom Charts/Power - 6
Power
Screen is blank;
computer does not
respond
1 Simultaneously press <Command> <Control> <Power On> keys
to reset computer.
2 Connect power adapter and reboot computer in 3-4 minutes.
3 Try known-good, charged main battery.
4 Check all logic board cable connections.
5 Replace logic board.
Note:
When replacing the logic board, check that the EMI clips
are securely attached to the CPU stiffener. The “CPU Stiffener”
topic in Take Apart helps you locate and identify the two EMI clips.
If both clips are not secure, replace the CPU stiffener.