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chscag

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

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This is a tough one. Normally I would agree that it could be the logic board that's acting up - intermittent connection. However, the fact that you can attach an external hard drive and the system works OK, makes me wonder how the logic board could be at fault. Of course it could be that the internal drive connection to the board is the only thing affected; but that would be unusual.

My next question: Is the machine still under any warranty? Such as Apple care? (I'm thinking it's not since you worked on it yourself.) If it is, take it on in and let the genius bar deal with it. My guess is that they will swap out the logic board.

Let us know.

Regards.
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