Notebook runs but only shows black screen

[Yerblonde]

I have an elite book that had windows 10 and was working great then one day started only showing a black screen. I have done the windows b key trick, the f11 trick, trying to connect to other monitor, nothing is changing. This is my daughters computer and all she told me was the black screen, I don’t know if updates were tried or anything else. 

[Yerblonde · Accepted solution]

I found the answer, blinking caps lock and scroll, 5x means the system board is down. Now what?