I did the swap, but I get a blank screen. Laptop still functions the same with external monitor.

The donor laptop would freeze, but I could at least tell that the screen did work. Does the graphics card matter? The original was dual, and the donor is single. I also noticed that the camera plugs are different sizes, so I had to leave that unplugged. Does that make a difference? Both laptops are mid year 2015 EMC2910.