How to diagnose logic board issues on a macbook

Written by jedadiah casey
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The logic board, or motherboard, is the central printed circuit electronic board inside a MacBook laptop that everything is connected to. The logic board is the pathway for all data flowing into and out of the computer. When the MacBook begins to function incorrectly due to hardware issues, the logic board must be tested to diagnose problems it may be having. Each Apple MacBook laptop ships with a diagnostic suite called the Apple Hardware Test. You can diagnose issues with the logic board, and other hardware on the MacBook, by running the Apple Hardware Test.

Skill level:
Moderately Easy


  1. 1

    Insert the disc containing the Apple Hardware Test suite in the disc drive, then restart the computer. MacBooks that shipped with Mac OS X 10.5.4 or earlier have the Apple Hardware Test located on the first Mac OS X install disc. MacBooks that shipped with version 10.5.5 or later have the program located on the second install disc.

  2. 2

    Press and hold the "D" key on the keyboard until the MacBook begins to boot from the disc.

  3. 3

    Click to select your language, then click the "Next" arrow.

  4. 4

    Press the "T" key to run the basic tests. If no errors are reported, proceed to the next step.

  5. 5

    Click the check box next to "Perform extended testing," then click the "Test" button. This may take several minutes to complete.

Tips and warnings

  • Any errors encountered with the logic board, or any other hardware component while testing, are displayed on the screen.

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