I have a 2015 version of Lightroom (on desktop). A couple months ago I tried opening it on my external harddrive. It looks like its opening but then doesn't. I see the opening screen (face), but then it just disappears. I've been scrolling forums with no luck. Any help would be greatly appreciated. I have sooo many pictures on it. PS I'm naive with all this so easy comprehension appreciated.. haha!! THANK YOU!!!