1/5/2023 0 Comments Mac startup keys diagnostics![]() Release the Option key after the Startup Manager appears on your display. ![]() Immediately press and hold the Option key on the keyboard. Insert the Install Disc 1 DVD that came with your computer into its optical drive. Note: If you have a MacBook Air®, see the AppleCare Knowledge Base document "MacBook Air: Using Apple Hardware Test."Ī PowerPC-based Mac with an Apple Hardware Test volume on Install Disc 1: See the AppleCare® Knowledge Base document "Intel-based Macs: Using Apple Hardware Test." Release the C key after the Apple Hardware Test appears on your display and indicates that it is loading. Immediately press and hold the C key on your keyboard.
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