Screen res defaults to 800x600 on external display

What I have:
I have my powerbook hooked up to an external 17" Philips monitor, via a KVM switch.
The KVM can handle resolutions far in excess on 1024x768.
What I want to do:
When I boot up the powerbook, I want the Powerbook to output to the external display at 1024x768
What is actually happening:
Instead, the powerbook outputs to 800x600. Oddly, the display on the powerbook also shows as 800x600.
If I click 'detect displays' in the sys prefs screen, the powerbook all of a sudden outputs to 1024x768 just as I like it. The screen on the powerbook also updates to 1024x768, too.
Any ideas on what might be causing this glitch?
Incidently, I tried bypassing the KVM and conecting the display to the powerbook directly, and the issue seems to persist.
I don't mind opening up sys prefs on each boot up, but it would be nice if it would default to 1024x768 automatically on each boot up, without my intervention.
Many thanks!!!
-Chris

Hello and Welcome to Apple Discussions.
Unfortunately this suggests that there is something more serious wrong with the graphics part of the logic-board.
Have you read this:
http://discussions.apple.com/thread.jspa?messageID=4349704
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