Quote from Racer X NZ :

https://www.lfs.net/forum/thread/87780-black-screen-on-load-up

Quote from Racer X NZ :

When you say " I open Lfs for a second time it just shows a black screen.", does that mean opening it again with another running session ?

Or, does it mean that you changed the graphics to a setting your monitor doesn't support and it shows a black screen after LFS is restarted. ?

If it's the second issue, try this...

"If, for any reason, LFS ends up on the Rift in 2D mode or with a black screen, you can get it back like this :
Method 1
Press ALT+F4 to exit LFS
Delete the file "card_cfg.txt" in your LFS folder, so LFS starts up on the primary device (usually your monitor)"
http://www.vrcircle.com/post/how-to-setup-and-configure-live-for-speed-on-the-oculus-rift

My reply to a later question.

This is usually caused by selecting a LFS video setting that your PC can't handle, usually...

That is not the issue. It has something to do with unlocking your license on 0.6J.