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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 40,956
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, Yosemite

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Your hardware tree is missing an entire device entry:

"Sound, Video, and Game Controllers"

That's the reason you have an ! over the entry for "Hi Definition Audio -" it's because you have no sound device installed. It looks like Windows is not detecting the RealTec sound device for some reason. That's why you can't install a driver, even if it's the correct one.

Take a look at this LINK. Go down to the bottom of the page and see if you can follow what he did to get sound working on his 21.5" iMac. Let me know if it works for you.
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