Begin by restarting your laptop. Sometimes, a simple reboot can fix minor software glitches that may be causing the keyboard to malfunction. If your Lenovo laptop keyboard is not working, first check if the problem is with the keyboard itself or with the software. Try connecting an external keyboard to see if that works. If it does, then the issue may be with the laptop's internal keyboard. In this case, you can try resetting the laptop by unplugging it, removing the battery, and holding down the power button for 30 seconds before plugging it back in and turning it on. If that doesn't work, you may need to replace the keyboard or seek professional assistance.