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Apple Computing Products:
macOS - Operating System
OS X Mavericks Hardware Diagnostics
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<blockquote data-quote="gsahli" data-source="post: 1583861" data-attributes="member: 182015"><p>I guess you've read this?</p><p><a href="http://support.apple.com/kb/PH11342" target="_blank">OS X Mountain Lion: Use Apple Diagnostics or Apple Hardware Test</a></p><p></p><p>For most(?) alternate startups, you hold the special key down immediately after the gong sound (not before or during), and until you see that it is starting differently. (my current Mac is a headless mini, so I don't do this test)</p></blockquote><p></p>
[QUOTE="gsahli, post: 1583861, member: 182015"] I guess you've read this? [url=http://support.apple.com/kb/PH11342]OS X Mountain Lion: Use Apple Diagnostics or Apple Hardware Test[/url] For most(?) alternate startups, you hold the special key down immediately after the gong sound (not before or during), and until you see that it is starting differently. (my current Mac is a headless mini, so I don't do this test) [/QUOTE]
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Apple Computing Products:
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OS X Mavericks Hardware Diagnostics
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