A green vertical line appears on the laptop screen. If the monitor is slightly tapped or moved the line sometimes disappears.
LCD screen failure.
Possible troubleshooting steps and repair solution:
If you have a single vertical line on the laptop screen running from top to bottom, this is LCD screen-related failure.
Most likely there is a faulty solder joint somewhere on the screen controller board, and tapping or moving the monitor temporarily “fixes” the problem, making the screen work properly for a while.
This problem cannot be repaired at home. You have to replace the laptop screen with a new one or use it as is with the line on it.