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I'm facing a strange problem. When I type +C with the left command key, it does not work anymore. The left command key is working for +V or +X or any others so it's not a hardware problem.

The C key is working too. The right command key is working for +C.

I tried changing keyboard language, adding a shortcut, reset NVRAM, activated/deactivated VoiceOver (tip found on a site) to no avail. I'm on a MacBook Pro with Mavericks.

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4  
Is this in only one app, or all apps? –  sdmeyers Nov 4 '13 at 19:32
    
It's on all apps. I created a new user, same problem. –  schwcoop Nov 5 '13 at 14:32

7 Answers 7

It was a weird experience for me, had the same problem. After long unfruitful research through internet, I took MBP to the Genius Bar. Even they tried with networked operating systems like 10.9, 10.8 and others too. Nothing worked, later after long technical discussion they decided it may be an hardware issue (due to shorting, also option button was not working during startup OS switching). After top keyboard cover replacement it worked! Again something unexplainable, yet worked!

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What has worked for me was force-quitting Finder (basically after trying all what you have suggested yourselves).

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Thank you for your insights! after clearing the cache, resetting PRAM, repairing disc and permission, nothing. Then it worked for a few minutes. Finally, I decided to use Keyremap4macbook and assigned the fn key to work like left command. It works, so I leave it like that. Problem half solved...

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  1. Open System preferences
  2. Select Keyboard
  3. Select Shortcuts
  4. Select Restore Defaults
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  1. Open System Preferences
  2. Select Keyboard
  3. Select Shortcuts
  4. Select Keyboard
  5. Select Move focus to next window
  6. Click on the key combination
  7. Set it to whatever you want
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1  
what does "Move focus to next window" have to do with this question? –  dwightk Apr 2 '14 at 13:43
    
Legend!! I was having a similar problem. Couldn't use Cmd + 1 . just wouldn't work on anything but I only used it the other day, followed your instructions and deselected "Move focus to next window" TADA!!! fixed! thankyou. don't know why you were down voted. Just because it didn't work for you, don't down vote a correct answer. Thanks mate –  doz87 Feb 5 at 5:58

I talked to the Apple support and reset my hardware by pressing shift+ctrl+option and the power button at the same time. Then release everything. To restart your computer, just press on the power button again.

It doesn't damage anything and even got back on the internet pages I was on.

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You might have a wrong keyboard layout set up on your system, i.e. Dvorak keyboard layout. If you switch to the proper layout you might fix the problem.

Go to System Preferences -> Keyboard -> Input Sources. Then click on "+" and add the keyboard layout of your preference.

Note: Dvorak users should know that there are a few types of the keyboard: Dvorak, Dvorak - Left, Dvorak - Right, Dvorak - Qwerty. Each of those acts differently when combination "Command + C" is pressed.

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