How to Use the Apple Service Diagnostic Disk (3 Steps)

Shut down your Mac.
Restart your computer with the Apple Service Diagnostic disc: shut down your computer, insert the disc into your computer's drive, then restart your computer and hold the 'Option' key as it boots up.
Wait for your screen to display the Apple Diagnostic Screen, then select the type of diagnostic test you would like to run. Press 'Enter' and your computer will reboot and run the test. This usually takes a few minutes.
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