I  made the mistake when configuring a external monitor, of changing the mhz to 75. When I close the MBP I now get a black screen on the monitor. How do I change it back?

I  made the mistake when configuring a external monitor, of changing the mhz to 75. When I close the MBP I now get a black screen on the monitor. How do I change it back?
I have a MacBook Pro with the latest operating system, trying to configure a Gateway flat monitor with vga.
Thanks

Apple menu -> System Preferences -> Displays.
System Preferences can also be found in the Hard drive -> Applications folder.
Resetting the PRAM can help bring displays back to factory settings if you can't find what you need:
http://support.apple.com/kb/ht1379

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