Hello I need some help/advice.

I think my GFX Card (GTX 670MX) misaligned in my laptop (ASUS ROG G75VX).
-My laptop dropped because my computer table broke.
-After I turned it on, the screen didn't go on. But the system turns on.
-So I tried connecting it to an external monitor and it still works without any problems. My laptop monitor is the one that is turned off.
-I took apart the laptop (it was scary because it is my first time to tinker with the innards of a laptop) and checked if something was torn apart. Thank god nothing was.
-After putting it back in and turning on the system, the screen turned on.... But with a blue screen. And while I was flipping the laptop over; the screen goes red, green, blue, pink. with all the fuzzy colors. So i touched the heat-sink while the laptop was turned on (the black one with the ROG logo) and miraculously, the display goes back to normal.
-The display is normal when I start to push the heat sink, but when i remove my hands from it, it just goes back to the diffused colors.
-So what I did was get a piece of rubebr and stuck in between the copper and the casing of the motherboard which let to it, pushing the heat sink as a sub for my hand.

I have read that the GTX670MX in the ROG G75VX could be removed and IS NOT soldered unlike the older models. I'm just not that sure because I haven't removed the heat sink yet and still haven't seen the actual GTX670MX in my lappy.

Do you think that is the problem? A misaligned gfx card? I need your advice. What should I do?

***Oh and i can verify that my system still runs smoothly as I still play AC:Unity using an external monitor.