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I've recently got Win 8.1 Pro and a new keyboard and mouse(Slimstar c110). The keyboard worked but suddenly both of my Ctrl keys aren't working.

I tried doing tests and doing shortcuts but they aren't working, I'm almost 100% sure the keys themselves aren't broken.

Are there any options that could have disabled my Ctrl keys?

  • Can you elaborate about those tests you did? – vembutech Oct 25 '14 at 15:46
  • I literally downloaded a program that lets you click a key and it shows the key you pressed on screen, I also tried doing some simple stuff like ctrl+c ctrl+p – AlexaCOl Oct 25 '14 at 15:47
  • If neither control keys are working anymore, then it means windows somehow registers that a control key is being pressed. This is known as a stuck key. This can happen if you hold a key while switching to or terminating a process. If you press that very same ctrl key again, it should resolve your issue. If you use a program to remotely connect to this computer, and you hold ctrl while disconnecting, the key may get stuck as well. It can also be that a shift or alt is being stuck. In any case, a reboot should solve your issue. Did you attempt a reboot? – LPChip Oct 25 '14 at 16:01
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    Try using a linux live CD and see if your control keys would work or not. – Prasanna Oct 25 '14 at 16:21
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    Check if ctrl key works over On screen keyboard – pun Aug 7 '15 at 15:08
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I had the same problem for months, both Ctrl keys and back arrow key did not work.

I had to reinstall Google Chrome, all keys then started working again.
This was possibly by accident or a related Chrome issue.

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Press alt+ctrl+fn to fix.

I am not sure why this happens, but I was also not able to use both the Ctrl keys and this worked for me. Please find below the related thread.

http://ccm.net/forum/affich-28177-control-keys-not-working-on-laptop

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Did the ctrl key ever work? You mention the keyboard is new, don't exclude the possibility of a manuf. defect.

That being said, there is a definitive way of diagnosing between hardware or software. Try booting to a linux live CD (or any other 3rd party O.S.), like mentioned in the comments. Here's a list of free software that will allow you to make the diagnosis. Ubuntu, DamnSmallLinux, Comodo Live, Hiren's BootCD, Ultimate BootCD

"Almost 100% sure" isn't very certain at all is it? Also, there's no point testing the keyboard using software if the issue is with the same software it question.

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I i cleaned inside of my keyboard with a soft napkin and vacuumcleaner incredibly control keys worked before cleaning both ctrl keys wasn't working.

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