SL not remembering ext monitor resolution on startup - any ideas?

Hello
I'm running 10.6.2 on an Intel Macbook and using a 22" external monitor (connection:mini DVI). Recently, when I start up the Mac and turn on the monitor, it doesn't automatically display 1680 x 1050 as it should, but at a smaller resolution, stretched. I've had to trash the display and window server prefs from By Host in my Preferences folder, and reset PRAM on startup, then plug/unplug the cable a few times before the Mac gets the resolution right.
Soo, once it's right, is there a way to 'save' those settings / set them as a default...??
I'm hoping I don't have to reinstall SL, or have to continually reset PRAM (can that do damage long-term btw?)
Any help appreciated.

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SL not remembering ext monitor resolution on startup - any ideas?

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