Gonna need more info to diagnose this. Has it worked on your machine before? Is the version current? Do you have SteamVR downloaded on your PC by chance? What are your system specs? Is there a transparent scan line overlay or is it just black? If so, is audio playing when you click on the window?
If it isn't a corrupted save file or Oculus/SteamVR interference, then I'm not sure what could be causing the issue. It makes sense that neither of those things are causing problems, as I'm sure I've integrated fail-safes for both of those things in the current build, but I haven't heard of an issue with an unwarranted black screen without any prior gameplay. I'm sorry I can't help more! Hopefully it'll fix itself with the next update.