Display gray, but OS loads and is fine in external display.

Hello there.
I'm having trouble with a PowerBook G4, where on starup
I hear the chime, but then the screen just goes gray. When
the external display is hooked up, after a while I will see
the OS loading screen. All seems normal on the external
display that I'm writing this on, but the screen on the PB is always gray. I tried doing verbose boot, but didn't see any text. I also can't seem to boot from the disc. I hold down option and the external turns blue, but it seems that it is
using it as an additional screen, and not mirroring. F7 didn't
seem to help in that case.
Any Ideas?

Hi,
Check that you have Color "LCD-4270800.icc" in /Library/ColorCync/Profiles/Displays ,
My was gone for some reason, I downloaded http://www.apple.com/support/downloads/macosx1048updateppc.html an anfter installing it, that profile is now in System Preferences/Displays, my computer recognizes the display as a Color LCD not as a "VGA" display like it did before.
NC
PowerBook G4   Mac OS X (10.4.1)  

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