Hi,
It seems like a problem with your LCD display itself based from the symptoms you experienced. Here are some troubleshooting steps that may help.
- Start with a hard reboot, unplug it's AC adapter then press and hold the power button for 20 seconds then try booting it.
- If these doesn't work you'll need to open your laptop and check the ribbon cable that connects the LCD to the motherboard.
- Unplug the ribbon cable on both sides (motherboard and LCD) and put it back in making sure it's seated properly.
- If all these will not work the only solution would be to replace the screen itself.