TroubleshootingHardware & printing
Computer troubleshooting and the 50% rule
The 50% rule helps identify a peripheral or cable that conflicts with a production Mac.
In this article
Use the 50% rule
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Shut down the computer and disconnect all external devices and cables except power, keyboard, mouse, and display.
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Start the computer and verify the original problem.
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Reconnect one device at a time.
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Restart after each newly connected device.
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When the problem returns, record the last device, cable, adapter, or hub added and contact Support with that result.
Choose the symptom
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