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You may have a damaged or disconnected audio board. Use this guide to open the computer and get to the board. Check the ribbon cable coming from the interconnect board is connected to it. If the cables aren't the problem, you may need to replace the board itself. Here is one for sale on eBay, as iFixit does not sell them.
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If you have upgraded your OS to Lion or (especially) Mountain Lion, this can cause your problem. Look in Apples support section for details, but all I had to do was reinstall the new OS... Problem solved.
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Has the unit ever been operated on?
由 mayer 完成的
Yes.
Just wondering. Could it be related to overheating?
由 Michele Carlo 完成的
This doesn't seem like it would be related to overheating.
由 Chris Green 完成的
I’m having the same issue with my late 2009 Mac Mini, which is on the last officially supported OS, MacOS X 10.11.6. I have another more upgraded one that isn’t slow that does have audio, but isn’t booting.
由 Jaden LeMieux 完成的