Firstly, it is important to check if the laptop is on and plugged in properly.

1. Check the power cord: Make sure the laptop is plugged into a power outlet.
2. Check if the AC adapter is functioning: Check if the AC adapter indicator is on and making a humming noise.
3. Check the battery: Remove the battery, wait for a few seconds, and then replace it.
4. Check the display: Hook up the laptop to an external monitor and check if the laptop is functioning normally.
5. Restart the laptop: Turn the laptop off and wait a few moments. Then turn it back on.
6. Check Windows updates: Go to the Control Panel and check for any pending updates or patches that may have caused the problem.