How to set monitor refresh rate more than 60hz in Fedora 13

Sun May 30 17:55:39 UTC 2010

I have installed the Fedora 13 on my computer today. I am using HCL's 17"
Monitor whose screen resolution is 1024*768 @85 hz. But in Fedora 13, I
can't be able to set my monitor's refresh rate more than 60 hz due to which
the screen is blurring. There is no Xorg.conf file in /etc/X11. Please help
me.
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