The wired/wireless keyboard is not working? Check this out

Issue: The wired/wireless keyboard is not working with the 2x1 Dual Monitor KVM Switch 4KSW21-DM.

Model: 4KSW21-DM


  1. Check the USB-A to USB-B cable connection: Double check that the USB-A to USB-B cable is securely connected to both the KVM switch and the computer. If the connection is loose, the keyboard may not work properly.
  2. Test different USB ports: Try connecting the keyboard to different USB ports on both the computer and the KVM switch. This will help determine if the issue is with a particular USB port or with the KVM switch itself.
  3. Check for compatibility issues: If the keyboard still doesn’t work, try using a different keyboard and mouse to see if there are compatibility issues with the current devices.

If none of the above solutions work, it may be necessary to contact our technical support at for further assistance. If this still does not work, you may require a replacement/refund.