Follow these steps to troubleshoot your wireless keyboard or mouse:

1. Replace the battery in the keyboard with a new one.
2. Check the USB receiver on the computer.
3. Clean the USB receiver, connectors, and keyboard.
4. Unplug all wired devices (if your computer uses a USB connection, unplug the USB receiver for the wireless device).
5. Restart the computer.
6. Reconnect the wireless peripheral devices to the computer.