Released on October 23, 2012. Core i5 or Core i7 Processor. Apple Fusion Drive.

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Some of the USB ports don't work?

I have a mac mini 2012, two of the USB ports do not work, the other 2 USB ports are perfect.

How can I fix the issue to use all 4 USB ports?

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@tom5 - What likely happened was you used the wrong power bricks for one of your USB devices so you burnt the ports fuse link. To prove this get a powered USB hub and plug it into one of the non-functioning ports and then plug in a passive USB device (i.e. thumb drive) if that works you'll need to get your system to someone who can do the micro-soldering and has the replacement SMT fuse link.

Of course you still have a problem! You'll want to label each of the power bricks so you know which one goes with which device so you don't damage any other ports.

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