Changing screen resolution by zapping pram

Hi
I persuaded a friend to go down the mac route. He now has a 2006 mac pro running Lion. When he boots up he sees the apple and the little counter thing, whatever it's called, and then the screen goes blank and his monitor tells him that there is no signal. I suspect it is as he is putting into VGA via an adaptor where previousy it was attached to apple cinema monitors and the res is set too high. I am trying to find a way to reset the screen resolution blind as he doesn't have anything else to put it through.
Would zapping the pram affect screen res, and if so what else into the bargain?
Thanks
Phil

Try starting in Safe Mode with the shift key held down while booting.
Mac OS X: Starting up in Safe Mode - http://support.apple.com/kb/HT1455
What is Safe Boot, Safe Mode? (Mac OS X) - http://support.apple.com/kb/HT1564
Safe Boot takes longer than normal startup - http://support.apple.com/kb/TS1884
If this lets you see things, you should be able to reset video in System Preferences, or delete preference files (sorry, not sure which one) for video.

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Changing screen resolution by zapping pram

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