Why is my laptop not detecting a second monitor through the VGA port after restarting the system?

1. Check cable and port connections: Make sure the correct cable is being used (VGA) and all ports are properly plugged in.
2. Verify all settings and configurations: Review display device and port settings and configurations, as well as the device's power settings.
3. Try different ports: Try a different port if none of the settings or cables appear to be the issue.
4. Check for software or driver updates regarding display: Check for any system updates that might affect the display, either the display device or the port.