Changing refresh rate blanks screen indefinitely

Hi all,
I'm new to the mac world and I was exploring OSX upon bringing my new Mac Pro home.
I have an old 17" Benq LCD monitor (upgrading soon) that I had hooked up using the analog to DVI adapter. I've heard that LCD's usually always are set at 60Hz but stupid me had to try other refresh rates. I set the refresh rate to 80Hz and the screen went blank and a box came up stating the refresh rate was "out of range".
I thought that it would automatically revert a la XP but after 5 minutes nothing. So in the meantime I just swapped to a different video output on the video card.
Could someone please tell me how I can revert the refresh rate to 60Hz so that DVI output can be utilized.
Thanks for reading!
Cheerz,
Flu
Mac Pro Quad   Mac OS X (10.4.10)  

Use the "Gather Windows" button in the "Display" pane of "Displays" System Preference. You can change setting for both displays from one display. You can also check "Show displays in menu bar" to get control of both displays.
Resetting PRAM, or a Safe Boot might help.
<http://docs.info.apple.com/article.html?artnum=107393>

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