HT204210: About the OS X Yosemite v10.10.2 Update
Learn about About the OS X Yosemite v10.10.2 Update
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Helpful answers
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Feb 2, 2015 5:33 PM in response to Mac Pro_2013_userby Eric Root,Apple doesn’t routinely monitor the discussions. These are mostly user to user discussions.
Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
Or you can use your Apple ID to register with this site and go the Apple BugReporter. Supposedly you will get an answer if you submit feedback.
Have you tried other USB ports?
Hopefully you have a back up and without a keyboard, you won't be able to revert easily.
If you do revert, I'd use Setup Assistant to restore your data. This process takes a while, so do it when you won't need the computer for several hours, based on my experience.
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Feb 13, 2015 1:11 AM in response to Mac Pro_2013_userby __42__,Hi,
You can try the solution given here -> Yosemite 10.10.2 update USB keyboard not recognised
I too had the same problem after updating to 10.10.2 and using an USB extension (which came along with the keyboard) worked.