![]() The test will run continuously until a problem is found. Looping On should appear in the right window. If Loop Mode is supported by the version of the Apple Hardware Test you are using, you run the Extended Test in Loop Mode by pressing Control-L before starting the test. It is especially useful when troubleshooting intermittent kernel panics. Running the Apple Hardware Test in Loop Mode overnight is an excellent troubleshooting step for finding intermittent hardware problems. Running the Apple Hardware Test in Loop Mode ![]() If the test fails, be sure to write down the exact message associated with the failure. You may want to run the Extended Test several times in a row as intermittent problems may not show up in every execution of the test. Your Mac will start up from the Apple Hardware Test volume.Ĭonsult the printed manual that accompanied your Mac for instructions on how to use the Apple Hardware Test that shipped with your computer.Īfter starting up from the Apple Hardware Test, run the Extended Test. When the wristwatch progress indicator disappears indicating that the Startup Manager's scan for bootable volumes has completed select the Apple Hardware Test volume.įor an illustrated example, see the AppleCare Knowledge Base document "PowerBook G4 (17-inch): How to Run Apple Hardware Test."Ĭlick the right-pointing arrow. 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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