IMac suddenly fails to recognize my Apple bluetooth keyboard

My old wired keyboard works fine. No damage is visible.  New batteries don't help.  It connects to my iPad just fine, but not the iMac running OSX10.8.5 Mountain Lion. in System Preferences>keyboard> Bluetooth keyboard search does not find a keyboard. Wireless mouse works fine.

First make sure the batteries aren't dead and that the keyboard hasn't already been paired with another device. If it hasn't, the keyboard should pair automatically when you reboot. You may have to press and hold the power button on the right side of an Apple keyboard until the LED starts flashing.
Otherwise see these support articles:
Mac mini (Mid 2011 and later) and iMac (Late 2012): Bluetooth keyboard may not pair during Setup Assistant
Apple Wireless Keyboard: Difficulty during pairing process
Unreliable wireless performance may occur when USB 3.0 external devices are close

Similar Messages

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    Please read this whole message before doing anything.
    This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
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    Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
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    Test while in safe mode. Same problem?
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