RHEL-Change display resolution

My operating system is Red Hat(RHEL 6.4).  At my logon screen, the message "Input Signal Out of Range"  Change Settings 1920 x 1200 -60Hz is displayed.  

When I log into the system to change the settings:::::I click---System--Preferences--Display
I receive this message Could not get screen information....RANDR extension is not present

How do I correct this?
gumball60Asked:
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gheistConnect With a Mentor Commented:
Ctrl-Alt-F1 will bring you to text console
mv /etc/X11/xorg.conf /etc/X11/xorg.conf.yayaya (do this other way around to get back where you started)
Ctrl-Alt-F7
Ctrl-Alt-Backspace
Now you wither get good display or config wizard.
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Seth SimmonsSr. Systems AdministratorCommented:
did you manually install any video driver?
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gumball60Author Commented:
No...The workstations are HP t5565 Thinclients
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SandyCommented:
Try modifying it from the master server. you need to configure Display parameters in /etc/X11/xorg.conf for client.

TY/SA
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