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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

mini - Headphone detection?

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Member Since: Sep 18, 2007
Location: Guam
Posts: 1,004
mac0s9user is a jewel in the roughmac0s9user is a jewel in the rough
Mac Specs: Gateway2000 P5-60. 66Mhz and 128 MB RAM.

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How is it a mac can tell the difference between a pair of headphones and my desktop speakers during boot up? For example if my headphones are plugged in I still hear the mac do the startup noise (from the internal speaker) however once I plug it into me speakers I don't hear it (speakers are off). Is this just a resistance check?
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