This is the second quick tutorial for black screen crash of Fallout 4 Game:
To fix my black screen issue (game got stuck and did not lauch), I follow those instructions (all credits to Sabutoros)
*delete the file "Intro_en.bk2" from the folder (Fallout4/data/video) (PLEASE KEEP A BACKUP IN SOME OTHER FOLDER)
*then make a copy of the file "GameIntro_V3_B.bk2" found in the same folder in ur desktop !!
*after doing this change the name of the file in desktop to "Intro_en.bk2"
*paste it back in the video folder of fallout 4 game !!