I connected my laptop to my desktop monitor with a VGA cable, I chose to only display the screen on the desktop not the laptop, I then removed the VGA cable without setting it back to normal, now my laptop screen is black, I have tried reconnecting the same VGA cable to the same monitor but no luck, I have also restarted the laptop many times, I have even tried a hdmi cable but still blackness on the laptop or no display on the desktop monitor.