Make sure you have Steam in game overlay disabled, Uplay overlay disabled for Ubisoft games, and close anything like fraps or radeonpro. (to see framerate in vorpx push Alt+f). Also make sure your not using any sweetfx or enb directly.
For me on my DK2, the oculus load screen would tell me “problems loading Skyrim.exe”, but if i waited a few seconds I could hear the game start up in the background. Screen would fade to black, and then if I waited 10 or so seconds the game menu would finally appear. Maybe try just waiting a minute to see if your black screen eventually comes on.