Internal LCD detected as VGA

The internal screen of my Powerbook g4 is no longer recognized as a Color LCD (1440x900) screen, but rather as a VGA screen (800x600). If I reboot enough times it'll eventually be recognized correctly but that may take anywhere from 1 - 100+ reboots to fix the problem. Crazy inconsistency and crazy frustrating.
From a few years back I quote this user who had the same problem (although no answer seemed to be posted)
"This weekend I finally got around to a complete re-install of my iBook to find out whether the problem is software related or not.
This is what I did:
1. Boot from install CD and remove all partitions from my disk. I now had a completely blank iBook with all software ran at boot contained in ROM.
2. Reset PMU
3. Reset NVRAM, PRAM using the keyboard
4. Boot the machine. For this I had an external screen attached as my built-in screen doesn't work from Open Firmware.
5. I got a folder with a concerned face on the external screen, nothing on the built-in screen. I now knew that the problem could not be resolved in SW.
6. I booted into open Firmware using the O+F key conbination
7. I reset NVRAM from the Open Firmware command line and rebooted (reset-all)
8. Problem remained
9. After that I started playing around in Open Firmware and saw that my screen was in its device list as built-in. Any command I gave to the screen however (eg blink-screen) was shown on the external screen.
10. I gave up and went through a rather painful data recovery process.
Conclusion: Something seems to be wrong in ROM? I am sure however that my ROM was never flashed. I have made no progress."
This problem seems to have been shared by a number of people in older posts - does anyone have a clue as to what is up?
Thank you.

This weekend I finally got around to a complete re-install of my iBook to find out whether the problem is software related or not.
This is what I did:
1. Boot from install CD and remove all partitions from my disk. I now had a completely blank iBook with all software ran at boot contained in ROM.
2. Reset PMU
3. Reset NVRAM, PRAM using the keyboard
4. Boot the machine. For this I had an external screen attached as my built-in screen doesn't work from Open Firmware.
5. I got a folder with a concerned face on the external screen, nothing on the built-in screen. I now knew that the problem could not be resolved in SW.
6. I booted into open Firmware using the O+F key conbination
7. I reset NVRAM from the Open Firmware command line and rebooted (reset-all)
8. Problem remained
9. After that I started playing around in Open Firmware and saw that my screen was in its device list as built-in. Any command I gave to the screen however (eg blink-screen) was shown on the external screen.
10. I gave up and went through a rather painful data recovery process.
Conclusion: Something seems to be wrong in ROM? I am sure however that my ROM was never flashed. I have made no progress.
iBook G4 Mac OS X (10.4.8)
iBook G4 Mac OS X (10.4.8)

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