Broken display/video mirroring

My powerbook G4 took a tumble and now the display screen is no longer working, although everything else still seems fine. When I connect it to an external monitor screen spanning works but there is obviously little I can do. I was wondering if there were some sort of key command that could launch video mirroring, and make my powerbook useful again. Thanks.

There had been a limited-use keyboard command that worked
with some Titanium PowerBooks, to toggle between Mirror, &
expanded/desktop mode. Not sure if that would do it for yours.
The 'Magical Macintosh Key Sequences' document in pdf shows
this as being the combination of cmd-F1 to toggle between video
mirroring and extended desktop mode (works on Ti Powerbooks)
Magical Macintosh Key Sequences:
http://davespicks.com/writing/programming/mackeys.html
Mac OS X Keyboard Shortcuts:
http://support.apple.com/kb/HT1343
There may be a terminal or command line in single-user able to
make the computer do this on each startup; which appears to
be the preferred idea given the circumstances at hand, since
a system reset or PMU reset would revert to default settings.
If the original screen is still attached to the body of the PB:
Try booting with the lid closed, using an external keyboard
and mouse. That will deactivate the internal LCD all the way,
and should let you display normally on the external monitor.
If that doesn't work, try booting without the CRT attached until
OS X is booted all the way, then plug in the external monitor.
It should automatically use it as the main display.
There should be a command line or other way to keep the
computer in the mode you desire after shut-downs, etc...
Good luck & happy computing!

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