Vertical Lines Laptop

Hello, for the past few weeks I've been experiencing vertical stripes that only appear on the left side of my screen and only when I start the PC! I've searched through forums but found nothing that indicates my problem... I thought it might be a bad connection between my screen and the motherboard, but if that were the case, the screen would just be off. I can also play with the appearance of the stripes depending on the tilt of the screen. The problem has been present for about a month and it didn't bother me because it disappears by itself after a few minutes... I've done all the driver updates and run a diagnostic of my PC. I don't think the graphics card is malfunctioning because I have very good performance in games, so I believe it’s my screen that’s the issue... Anyway, I would like to know if I need to change the screen or if it’s just a connection problem... The warranty for my PC has expired.
The lines can change color depending on the application open.

Model: HP Pavilion Power Laptop 15-cb0xx
Spec: GTX 1050 4Go
I5 7300HQ
16 Go RAM 2400Mhz Crucial