I used to have the same problem, but managed to fix it!
It's all in the f1graphics.cfg!
I can't remember what the exact line you have to change is, but that's how i fixed it.
I'll have a look now
EDIT:
Found it
Change this line:
0 ; [RELEASE] Number of multisamples if available (0-16 :: 0 => off, 1 unused)
Multisamples must be 0, or you will get blak screens.
You can always run in windows mode to get the game running with multisamples, but for fullscreen, it must be 0!
Edited 1 time(s). Last edit at 05/10/2013 11:35AM by ralv585.