Are u running a fresh install???
Boot your system in single-user mode and edit the /etc/inittab file and change the runlevel from 5 to 3.
Runlevel 5 starts X after startup, while 3 would leave you in a working console.
to boot in single user mode, select the entry in the grub loader that is your linux bootup, and press "e" to edit that. select the kernel= line and press "e" again, and at the end of that line, add " 1" ('space' and '1'). Save changes and hit "b" to continie booting... this will put you in single-user mode... just edit /etc/inittab and reboot...
It seems RedHat 8 is not fully competible with the hardware (in simple words). It might be the problem with your graphics card.
look at --->/etc/X11/XFree86Config file as to what is going wrong..
Red Hat has written their own tools for most system configuration tasks. If you type "redhat-" at the command prompt then hit the key twice you will see the following tools:
redhat-cdinstall-helper
redhat-config-bind
redhat-config-date
redhat-config-httpd
redhat-config-keyboard
redhat-config-language
redhat-config-mouse
redhat-config-network
redhat-config-network-cmd
redhat-config-network-druid
redhat-config-nfs
redhat-config-packages
redhat-config-printer
redhat-config-printer-gui
redhat-config-printer-tui
redhat-config-proc
redhat-config-rootpassword
redhat-config-samba
redhat-config-securitylevel
redhat-config-services
redhat-config-soundcard
redhat-config-time
redhat-config-users
redhat-config-xfree86
redhat-control-network
redhat-install-packages
redhat-logviewer
redhat-update-gnome-font-install
redhat-update-gnome-font-install2
Backup ur old --> /etc/X11/XFree86Config to a new directory or just rename it using
#mv /etc/X11/XFree86Config /etc/X11/XFree86Config.OLD
Use the -->#redhat-config-xfree86
command to setup ur new xfree86 config file , save it , and #startx to go into graphical mode..
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Info about MTRR -->
http://bernia.disca.upv.es/lxr/http/...ation/mtrr.txt
**********USE AT UR OWN RISK***************