Thank you for your reply, but apparently the monitor is fine, cause I managed to run the system once, and everything was working without any glitches. It led me to conclusion, that monitor is not an issue.
PS. By the way, I tried second monitor (TV, to be exact) at the same time, switched cables between them, connected to different ports at videocard, and the only time it worked was with the original monitor.
But thanks anyway. I must be cursed or something :Smile: