My external monitor works but I can't get my screen to work on my power book anymore

Can not get my screen on power book G4 to work but my external monitor works fine. Did I press something and turn it off?

rm44 wrote:
The both screens always worked fine but now the power book doesn't show anything on the screen.  I didn't drop it or even move it.  Where is the brightness button?  Could I have hit it by mistake?
Thanks so much for your help.
F2 is the up-brightness button, F1 is the down-brightness button, usually, on PowerBooks.  If for some reason the F1 button got held down for a couple of seconds, the display would go completely dark.
That being said, if the backlight does not come up (easily determined by seeing if the Apple outline on the cover is lit up) then the most likely suspect would be the inverter board, or the connection to the inverter board.  If this is a Titanium PG G4, the inverter board is easy and relatively inexpensive to replace.  For the Aluminum models, I don't know if that is quite so true.

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