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Helpful answers
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Apr 29, 2015 10:57 PM in response to Rngifnindifndifneby K Shaffer,★HelpfulYou may use a wired USB keyboard which could also help troubleshoot the computer.
If there is a hardware reason inside the computer for the failure of Bluetooth, then you
may seek to have it looked into at an Apple Store genius bar (with appointment) so as
to see what may be the cause of this symptomatic failure. And if the iMac is under
warranty, they can refer you to repair; the diagnostic is usually without cost at official
Store. And if no official Apple Store with genius bar is available, an authorized Apple
service provider location or specialist may be able to help resolve issues.
If the keyboard isn't syncing with the iMac, there may be other things to be done, but
a working USB keyboard is first in the line of troubleshooting items to have on hand.
If you have an Apple USB keyboard, that's best. You could use Windows PC keyboard
but some keys are different; these are linked sources to read and understand how to
use a windows keyboard where certain keys have other meaning...
From apple, covers most keyboard issues, also helpful with windows on Mac:
•Boot Camp: About keyboards and key assignment for Microsoft Windows - Apple Support
From microsoft:
•Keyboard Mappings using PC Keyboard on a Macintosh:
https://support.microsoft.com/en-us/kb/970299
There is a reset, usually best done with USB wired keyboard, that may help, the SMC
or system management controller could help items work that aren't doing well. Or if
the problem relates, there is different reset NVRAM that does some other stuff.
•Resetting the System Management Controller (SMC) on your Mac - Apple Support
In any event...
Good luck & happy computing!