HP pavilion dv6 Laptop Screen flickering

[amateur_programmer]

Hi,

My laptop (hp pavilion dv6) screen keeps flickering with a small red line that appears at the left side of the screen. I have been having this issue from 3 months but now its getting worse. For testing purpose, I projected the laptop on an external LCD screen with the Duplicate option selected, after doing this the flickering stopped in my laptop but the external LCD screen flickers. The minute I disconnect them, my laptop starts flickering again.

What could be the reason behind this issue? Is it the LCD cable or the graphics card that's causing this?

 

[robert600]

have you tried fiddling with resolution setting - if so, does it flicker on all of them?