Stuck with 1024x768 resolution/monitor/display

After re-installing Snow Leopard on my friend's mac,
My screen resolution/monitor/display can only get 1024x768. System Prefs doesnt allow me other display options, they are blank.
Asked, Googled, people say it may be bad/corrupted video kext.
Is this the case?
If so how to find the folder where video kext is and
where to get the clean video kext file to replace?
Thanks so much!

Reinstall OS X, but erase the drive first. If you reinstalled over an existing but corrupted system it could cause this problem.
However, the first thing to do is: How to Rest the PRAM
Message was edited by: Kappy

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