I had this problem one time when I decided to stuff around with my computer. I found out that I had bent a tiny pin when plugging in my keyboard. What a nightmare it was..
I really thought that the computer would just say that there is no keyboard attached to the computer but it didn’t.. It threw me a black screen and looked like it was a disaster…
That is until I retraced my steps on EVERYTHING I had touched.
I am not an expert but I am interested in learning. 🙂