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Not enough detail. It is good that you included the error, but you need to provide details about your hardware, specifically your video/display information.
I am not sure about the new version of RedHat but in older versions a kind of similar error was reported when the monitor was not properly configured (wrong specification etc.). It was in my initial days with linux so I reinstalled and it worked fine. If U installed linux recently try the upgrade option on bootup with the CD and choose the correct monitor type, sync rate, resolution etc.
Try using the command below, and see if that will work.
redhat-config-xfree86 --reconfig
Or you can edit the file /etc/X11/XF86Config and in the Section "Device" use the "vesa" driver and in Section "Screen" choose to have a 800x600 to keep somthing going then startx, if this will work you can try to change it to higher setting/resolution.
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