Problems with video card were resolved.
Because of applying in Fedora 14 new video configuring system, now it detects and
configures video automatically, without using "xorg.conf" by default, on each
start of system
(
http://fedoraproject.org/wiki/Common_F14_bugs#Miscellaneous_graphical_pro...).
So, I just removed: 1) "/etc/X11/xorg.conf" file _and_ 2) "nomodeset"
kernel parameter in "/boot/grub/grub.conf" file.
All troubles with video disappeared after reboot :)