If your keyboard isn't working, the problem is likely a lost connection. The connection between the keyboard and the USB receiver can be lost for several reasons, such as:
- Low battery levels
- Moving the receiver from one USB port to another
- Moving the USB receiver to another computer
- Plugging the receiver into a USB hub or other unsupported device such as a KVM switch (NOTE: Your receiver must be plugged directly into your computer.)
- Using your wireless keyboard on metal surfaces
- Radio frequency (RF) interference from more powerful devices such as:
- Wireless speakers
- Computer power supplies
- Cell phones
- Garage door openers
Before reconnecting your keyboard
Fix or rule out the potential problem sources listed above.
Make sure you have fresh batteries in your keyboard. For instructions on changing your keyboard batteries, see answer 360023258774.
Plug the USB receiver securely into a working USB port on your computer.
Turn on your computer.
Reconnecting your keyboard
Download and run the Logitech Cnnection Utility software from the MK215 Downloads page.
On the Logitech Connection Utility Software Welcome screen, click Next to continue.
Follow the on-screen instructions to turn your keyboard off and then back on.
NOTE: The keyboard doesn't have an on/off switch. To turn the keyboard off, remove and then re-insert the batteries.
When your keyboard is detected, you'll see the confirmation message below. Click Yes and then Next.
Click Finish to exit the Logitech Connection Utility software. Your keyboard should now be connected.
If this solution doesn't work after a couple of attempts, restart your computer and try the reconnection process again.