hey guys... please can someone help....
I installed redhat 9 on my machine yesterday, dual booting with Win XP.
everything was working great, i changed my monitor type, and then my screen resolution, which changed the refresh rate as well. when i booted into linux again...all went well, but the refresh rate is out of sync so i cannot see the login screen. how do I undo the change I made to my system? I know I could do it if I could get a monitor that will handle the refresh rate, but it is not so easy to buy a 17" monitor.. I am sure there is another way... could someone just please tell me how??

I am very new to linux and am trying to learn how use it ..... so please make the solution easy for a newbie to understand!!!

You can change the monitor settings manually by editing the /etc/X11/XF86Config or /etc/X11/XF86Config-4 file or you can use xf86config which will go through setting up your mouse, keyboard, video and monitor again. You may need to be root to save this file.

If neither of those 2 files exist type man XF86Config to see other possible locations for the file

If you used a tool to change your /etc/X11/XF86Config-4 file, there is probably a backup of this file made with a character appended to the filename. I don't have Red Hat, but you could look for a 'XF86Config-4-' or 'XF86Config-4~' file.