Red Hat Enterprise 5 display mode detection issue - redhat

I have installed Red Hat on my HP 550 laptop and the display resolution does not fit my Laptop's display. My display works great with windows 7 and it is 1280 x 800 , once i enter in RedHat i see the screen like a box and does not fit the whole monitor of my laptop, I log in with root password and try to change X display settings but there is just one setting -- 1024x700 -- and I can not change it.
What can be the problem that causes this?
Kind regards,
-- A.Xheladini

You should really try a Linux forum for this question, but here's a page that can help you

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