Final answer:
If none of the keys on a newly installed laptop keyboard are working, the technician should check the connections, restart the laptop, check for updates, and test the keyboard on another computer.
Step-by-step explanation:
If a technician finds that none of the keys on a newly installed laptop keyboard are working, there are several troubleshooting steps that can be taken.
Firstly, the technician should check the connections between the keyboard and the laptop to ensure they are secure and properly inserted. If the connections are fine, the technician can try restarting the laptop and checking if any software updates are available.
Additionally, it may be helpful to test the keyboard on another computer or try using a different keyboard on the laptop to determine if the issue is with the keyboard itself or the laptop's settings.