Dell Latitude E6420 Black screen of death but external monitor working

I believe I have solved the Dell Latitude black screen of death puzzle that no one has ever effectively answered.

I purchased a used Dell Latitude E6410 laptop which worked perfectly. A few weeks ago I managed to crack the LCD screen by stepping on the laptop. I decided to replace the screen.

My original screen was made for Dell by AU Optronics. This screen worked perfectly with the software and hardware in my Dell Latitude E6410 using Windows 7. The replacement screen I purchased (which was said to be the correct replacement for the E6410) was made by Samsung.

The minute I put the Samsung screen in, the black screen of death problem began occurring and no matter what settings or updates I use, I cannot solve the black screen of death problem.

Dell used both AU Optronics and Samsung screens in the Dell Latitude line. The reason why Dell has never offered an explanation or solution for the black screen , and if they admitted that problem there would be a huge class action suit against Dell.

Thanks for the solution! I have the same problem.

@Brad Cheng: What a nonsense, you're totally wrong.

#1: You talk about E6410, but even there it's nonsense.

#2: Dell using different OEMs, so far correct, but these parts are interchangeable with eachother. In the case of the display of E6420 it must only be same resolution, technics, connector and measures.

#3: If Dell would use parts from different OEMs which aren't interchangeable, they'd bring avoidable trouble in their warehouses, no company is doing that, they wanna save costs.

Don't miss to disconnect the battery and charger before you change display. Especially batteries are often the reason for sudden death of displays in this matter.