Windows 10: How do I solve flickering white line on laptop screen problem?

I don't know how to solve this problem. I've watched YouTube tutorials and read online articles but nothing has worked.https://youtube.com/shorts/X1nnLP4NZ5M?si=0PLB0kJyJb_g1nQMAnt solutions would be greatly welcomed.

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Laptop screen showing flickering horizontal lines and sometimes white boxes

I have an hp laptop I bought it last year. It recently started having flickering horizontal lines or white boxes on the screen and it goes to sleep. When you try to switch it Back on it doesn't and when it does the same problem. I recently changed operating system but it still does the same.

 

Flickering screen -> grey frozen screen or white/blue frozen screen with white horizontal lines in Windows 10.

I recently successfully installed Windows 10 and now I have problems with 3 different scenarios:

1. Normal login into Windows 10 then being on the Internet website or email the screen suddenly becomes flickering that leads to the screen that is partially white on the left side and the rest is blue with multiple horizontal lines through the screen. Have
to reboot the computer to login again to the windows.

2. Sometimes flickering screen leads to a grey frozen screen. Have to reboot the computer.

3. Sometimes flickering screen leads to "Your PC ran into problem..." with automatic restart.

This is really annoying. Please help!!!!!

 

Flickering and blinking laptop screen

I'm using a laptop with Windows 10 and an Intel HD Graphics 4600 display adaptor. A few days ago I attached a Dell D3000 dock to my laptop, and almost immediately my laptop screen started to flicker and repeatedly blink off and on again. I disconnected the dock, which did not resolve the problem, and since then I've tried various techniques to fix the problem, but none of them have worked. In order, this comprised of:

1. attempting system restore - but all five restore points were corrupted (?!);
2. updating the driver for the Intel display adaptor;
3. rolling back the driver for the Intel display adaptor;
4. uninstalling the driver for the Intel display adaptor;
5. downloading Windows 10 from the Microsoft site and re-installing it.

The problem has persisted even when I disconnected everything from my laptop, took it to my workplace, and switched it on there (using its battery for power); so the following possible reasons can be ruled out: its location in my house, any attached peripherals, a faulty power cable.

I am certain the problem is in some way connected to the Intel HD Graphics 4600 display adaptor:

1. after I completely uninstalled it - which reverted the graphics card to the standard Microsoft one - the screen didn't flicker or blink once afterwards (I left the laptop switched on for about an hour without incident, whereas previously I would experience as many as ten 'events' a minute). This rules out a possible damaged connection between the body of the laptop and its screen. However, when Windows auto-installs updates it reinstates the Intel one...
2. ...and when the laptop is switched on the screen flickers and repeatedly blinks off and on again...
3. ...although, strangely, connecting an external monitor to the laptop (HDMI to HDMI) results in neither the laptop screen nor the external monitor flickering or blinking. The problem returns when I disconnect the HDMI cable from the HDMI port on the laptop.

I now have the inescapable feeling that when I attached the dock I somehow fried the Intel display adaptor, and it isn't possible to fix it: I have read in the forums that replacing the graphics card on a laptop is well-nigh impossible. But if anyone else can suggest an approach I haven't yet tried I'd be very receptive!

As an aside, I contacted the retailer and they have sent me all of the drivers that are available for my system, but I don't know how to install them.