Hey new to this, but I got mountain lion retail, and downloaded MLPostFactor I did everything but used 10.8.4 instead of 10.8.4. it seems to go fine until after I until after it installed. It then stays on a grayish black screen. you can move the mouse around but the screen doesn't change. If you restart it a no smoking type sign comes up. I have a late 07 macbook running lion, 2 gigs of ram and Intel GMA X3100 graphics. any help would be greatly appreciate.