Here are a few suggestions to troubleshoot your laptop’s display issue:

1. Verify the display is powered on and plugged into a wall outlet.
2. Check the laptop’s settings to make sure the display is set to stay awake, if that option is available.
3. Check the laptop’s power settings to ensure power is being re-directed to the display.
4. Ensure the display driver is up-to-date and functioning as intended.
5. Check the laptop’s Display settings to ensure they are set properly. Additionally, check the brightness of the display.