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
- Monitors
- Cell phones
- Garage door openers
Before reconnecting your keyboard
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Fix or rule out the potential problem sources listed above.
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Make sure you have fresh batteries in your keyboard. For instructions on changing your keyboard batteries, see answer 360023258774.
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Plug the USB receiver securely into a working USB port on your computer.
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Turn on your computer.
Reconnecting your keyboard
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Download and run the Logitech Cnnection Utility software from the MK215 Downloads page.
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On the Logitech Connection Utility Software Welcome screen, click Next to continue.
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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.
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When your keyboard is detected, you'll see the confirmation message below. Click Yes and then Next.
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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.