HT201257: Using Apple Hardware Test
Learn about Using Apple Hardware Test
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Helpful answers
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Feb 20, 2012 4:54 AM in response to Ethan Hallby Shootist007,What are you trying to do with the D key. Try Option+d or Command+d.
If you are trying to run the Online Apple hardware test I'm not sure your system supports that. The AHT is included with the Applications DVD that came kwith your system.