green vertical line turned to red after shutting it down

[screenn]

i found a green vertical line on my laptop screen so i tried to solve it by checking the resolution then i pressed windos + x button then  device manager then i shut it down for 3 hrs after opening it i found the green line changed to red what shall i do my laptop is hp core i5 8thgene

[Echo_Lake]

@screenn

Thank you for posting on the HP Support Community.
 

Don't worry as I'll be glad to help, however, to provide an accurate resolution, I need a few more details:

• When was the last time it worked without these issues?
• Have you updated Graphics and Chipset drivers?
• Have you checked the display on an external monitor?
• What is the product number of your device? Use this link to find it: http://support.hp.com/us-en/document/c03754824

Let’s try these steps to resolve the problem:

I recommend you attempt to access the BIOS screen by tapping on F10 while the computer is restarting, 

If the issue persists in the BIOS screen which is outside windows, it would confirm a hardware failure.

Hope this helps! Keep me posted for further assistance.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.