Hi mikey31,

There seems to be problem with the LCD screen on your computer to confirm we will have to perform the ‘LCD BIST’ (Built in Self-test) on the computer. Please follow the steps mentioned below to run the “LCD BIST’.

1. Turn of the computer.
2. Press and hold down the ‘D’ key on the keyboard and press the Power button.
3. You will see different colors on the LCD screen. Please check if the white line across at the bottom of the screen.

If you see the white line appearing on the screen while the LCD bist is running you will have to replace the LCD.

Also, Please connect an external monitor and check if the issue reoccurs.

Thanks, I updated graphic drivers and when I rebooted it seem to be okay for now. Thanks for your help.

The line came up again, it's there while the computer is booting up and once it's booted. I did the test but couldn't see the line.