After some time of installing i got to the conclusion that something in FC5 is dead born - X.org insted of starting is hanging the computer. If the original FC5 installation at the hang-time shows something, then the installation from updated set of files did not go even so far. After that conclusion i tried to install CentOS 4.3 x86_64, which fortunately works. I have to add that SUSE 10.1 x86_64 liveCD also worked good on that machine. ***