Moniter Screen.

Hello, I've been having a problem. I was wondering if you could help. I am on my father;s laptop at the moment.
A few months ago, my computer screen has been..going weird; so to speak. It was working fine, until the screen started flickering, and then soon I was not able to see anything at all.
My father said it was the monitor, so he just changed it to an old one I had. That one, worked fine, but I started noticing flickering across my computer screen as the days went by. I kind of ignored it. I really did not think anything was wrong with it.
In the morning today, it was working fine when my dad used it, but when I got home, it was on, but the screen was just blank.
My dad thinks its just the monitor, but I think its something else entirely. I heard from a friend, that it might be the graphics card.