To troubleshoot a Logitech keyboard, begin by confirming that it has power and has a proper connection to the computer. Checking or reinstalling the drivers can also resolve issues with the keyboard.
The USB connection could be loose. Unplug the keyboard, then plug it back in. You can also try connecting the keyboard to a different USB port. Unplug any USB devices that you are not using. If your mouse and keyboard use Bluetooth, confirm that your computer’s Bluetooth is active and detects the mouse and keyboard. If you are using a wireless keyboard, troubleshoot the wireless connection.
Next, check to see if the keyboard and mouse are turned on, by confirming that the power indicator lights on the keyboard and mouse are green. If not, turn them on. Also, replace dead batteries with fresh batteries, and if your mouse and keyboard use rechargeable batteries, let the batteries recharge before using the device again.
If none of these resolve the issue, and you are using Windows, uninstall the drivers in the Control Panel, then visit the Logitech website and install the latest drivers for your keyboard and mouse. Sometimes, the Logitech drivers are at fault for a bad connection. If your keyboard and mouse are still failing to function properly, you may also visit the Logitech Support website and browse the support page for your product’s specific solutions.