Suddenly can't get video over the projector (same equip has worked well in the past) - but the PowerBook thinks it's sending video that way, since it has moved the primary output over to that, so all that's on the built-in LCD, is blank desktop and a moving cursor. Removing the video adapter from the PowerBook causes it to switch back to the LCD, so it's not a hang/crash.
Not sure what the fix is yet, but found some great resources/info at SFSU AV:
Portable Mirroring Activation Chart.
PB G4 mirroring tips.
AV Tutorials and Hints.
and the best collection I've seen, of magic Mac key combos.
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