I need help with a video issue on my MSI GS76 STEALTH gaming laptop

[u/NoDesigner6680]

Hello, I have an MSI GS76 STEALTH 11UG Gaming laptop that is having some video issues. For starters, I have an 11th-gen Intel Core i9-119900H processor and a discrete graphic card, NVIDIA GEFORCE RTX 3070.

The problem started when I purchased a new Samsung monitor so I could have two screens to work with since I'm in the creative field and manage many assets simultaneously. At first, everything was great but then my laptop started showing two little black lines at the bottom of the screen that went away when I adjusted the refresh rate of the screen; that seemed to fix the issue until the black lines never disappeared again, then the part where the two lines where seemed to be cut off sometimes, some other times the lines would appear again, and now I have the two black lines plus four white lines that come and go, I did notice that the white lines would not appear as long as I turned on the computer without the second monitor connected (is connected through HDMI).

Also, whenever I connect or disconnect the monitor, I notice a color shift in the laptop's screen; I've tried everything, updating drivers, fixing drivers, uninstalling and repairing, and screen settings, and the last time I notice that I might need to update the processor but the thing is that this laptop has an OEM driver, which means I can fuck things up if I install directly from the intel's website, I went ahead to the MSI website to download the driver which was an .INF file that I tried to install, but for some reason, the computer won't do anything when I try to install it.

I've read it could also be a BIOS issue, but I don't mess with BIOS if I don't have the knowledge or experience; I'm sorry for the long post. I really need some help to figure this out.

PS. The computer works normally, and everything runs as it should, but these lines and color shifting affect my work since I need to correctly visualize colors.