Main screen gray - external display works

Hi,
My PB G4 17" 1.0 GHz has a problem with its main screen. However it is still lit, it doesn't show anything. I can still operate the brightness and see the screen become more bright or dim.
When I attach a second display, I see video there. So the machine itself still works, boots, etc. but video on the main display isn't shown.
I've already reset NVRAM and the PMU but unfortunately that didn't help.
Any ideas what to try next?
Thanks in advance.

This sounds like it could be a hardware problem with the inverter or inverter cable for the built in display. Since you have video on the external, the chip on the logic board seems to be functioning. I don't know of any software fix for this--I think the hardware will need to be repaired or replaced.
Good luck!

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<Serial Number Edited by Host>

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