X Won't start

[cyberblade3001]

System was running fine, rebooted it and X no longer starts:

# startx
xauth: creating new authority file /root/.serverauth.2225

X Window System Version 7.1.1
Release Date: 12 May 2006
X Protocol Version 11, Revision 0, Release 7.1.1
Build Operating System: Linux 2.6.18-53.el5 i686 Red Hat, Inc.
Current Operating System: Linux k2 2.6.18-194.8.1.el5 #1 SMP Thu Jul 1 19:07:06 EDT 2010 i686
Build Date: 13 May 2010
Build ID: xorg-x11-server 1.1.1-48.76.el5_5.1
Before reporting problems, check (url removed)
to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue Aug 31 09:40:21 2010
(==) Using config file: "/etc/X11/xorg.conf"

(EE) I810(0): Cannot open /dev/mem
(EE) I810(0): VBE initialization failed.
(EE) Screen(s) found, but none have a usable configuration.

Fatal server error:
no screens found
XIO: fatal IO error 104 (Connection reset by peer) on X server ":0.0"
after 0 requests (0 known processed) with 0 events remaining.

System is CentOS, Linux version 2.6.18-194.8.1.el5

If anyone could point me towards whatever documentation I need or what steps I should try next I'd much appreciate it.

[devils casper]

Did you upgrade it recently? Try to rename xorg.conf file.

cd /etc/X11
mv xorg.conf xorg.conf.n

In case it doesn't work, attach /var/log/Xorg.0.log file here.
Post the output of this

lspci | grep -i /etc/X11/xorg.conf

Check Hard disk for errors too.