@Louis-0 idk if we have same issue but I have an optiplex 9020a. I use a USB hard drive to load up recallbox. It brings up a menu with two recalbox os. The first one just sits there with black screen. I've even waited an hour just in case it was being slow. I found that it only loads with the second option. Once I've had it load once I shut it down in the menu then put it internally in my optiplex. For some reason it will only boot when external first start. Then boots up fine after that with the second option. It will still sit there in a black screen with first recalbox option selection