I just tested upgrading a Red Hat Linux 9 machine to CentOS 5. The upgrading process ran smoothly except after upgrade the X server did run.
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Usually, the problem might be due to the installer uses horizontal or vertical frequency that the monitor could not handle. The fix of this kind of problem is easy, I only need to modify the /etc/X11/xorg.conf file and restart X server. However, it didn’t work this time.
I then tried to start system-config-display , but the monitor complained about the signal is not displayable. I was not able to use system-config-display at all.
I used X forwarding from a remote machine and I hoped that I can use system-config-display this way. The system-config-display ran fine, but when I restarted X server, the server still could not start.
Finally, I found that the driver was not installed through the log file. After I did a yum install xorg-x11-drv-ati , the X server was able to start.
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