So i was playing LFS and my FPS was 30 and i tryed to make it better so i went to Options then i selected screen number or what ever to 80 Khz and now i have that kind of message from my monitor : Not supported ...And i got black screen only...Do i have to reinstall game?

delete card_cfg.cfg, if that doesnt work try finding the line in the cfg.cfg, if not then just copy cfg.cfg from a clean copy of LFS


if all that doesn't work, then you might want to re-install