When working at a computer or laptop, he suddenly notices that there is no response from the left CTRL-key. Even after connecting an external keyboard, the CTRL key still does not work. This problem is faced by users of Windows 7, 8.1, 10.
Why did the left CTRL key stop working?
This problem can be encountered for a number of reasons:
Faulty keyboard. Before focusing on the rest of the reasons, you need to make sure that the button is working. Plugin another keyboard and see how it works.
Erroneous Windows update. There is one package aimed at extending the advanced shortcut options, after installing which there are problems with the left CTRL. To install all pending to update the system to the latest version.
Faulty HID driver. In most cases, he is responsible for the occurrence of this problem. A damaged instance can break the functionality of some keys. After reinstalling it in the Device Manager, the functionality of the button should be restored.
Check for physical damage
First, you need to make sure that CTRL does not work due to any physical damage to the keyboard. Connect another one and check its functionality. If the problem is with your laptop, plug in a USB keyboard.
If, on the other hand, there is still no response when pressed, then its functionality is not associated with damage to the device. Then go to the next step.
Installing pending Windows updates
In this step, you need to make sure that you are using the latest version of the OS. There are a number of cases when after updating the system to the latest build, the key started working again.
Open the “Run” window by pressing Win + R together. Type in the input field ms-settings: windowsupdate and click on “OK”.
Click on the “Check for Updates” option and wait for the procedure to complete.
If verification determines that there are pending packages, follow the onscreen instructions to install them. If the system prompts you to reboot, confirm it, but remember to return to this screen after startup to install the rest.
Then restart your PC and check if the problem is resolved. If the left CTRL-key still doesn’t work, go to the next method.
Reinstalling the driver
Often this system button does not work due to a faulty HID driver. In this step, we will try to reinstall it using the Device Manager.
In the “Run” window, which is called by pressing Win + R together, type the command devmgmt.msc and confirm its launch with “OK”.
Expand the Keyboards tab. Right-click on the HID input device to open the context menu and select Delete. If there are several of them, reinstall for each.
Restart your computer so that the OS reinstalls the drivers during startup.