Powerbook G4 15" screen blank, can't connect to external monitor

Hi,
I've had a 15" Powerbook G4 for about 2 years now, but about a year ago, I switched it on and the display was white. I could hear the startup chime, and everything seemed to be working fine underneath, but the screen was just white.
So, recently I took it to an Apple store and in the end, they told me that the LCD was broken and that they would have to replace it for the Powerbook to work properly. As this would cost over £400, which I can't afford, I just decided to try and use an external monitor with it, as they had done in the store to check it.
So, I bought a DVI-VGA adapter from eBay, received it this morning, and tried to connect the Powerbook to my CRT monitor using the adapter.
Basically, I plugged the VGA cable from the monitor into the adapter, and plugged that into the Powerbook.
However, the external monitor just stays blank, as if it isn't connected to the Powerbook.
Please, can you tell me if I'm doing anything wrong, and if not, suggest why it might not be working.
Thanks,
sharkofmirkwood

hi i did this as posted by yan pb15 i had everything back internal and external monitor it is a wonderful trick!!!
thanks yan pb15
This "last" solution worked for my PB15 osx 10.4.11 (somebody can help you; it is at your own risk!)
1. set in Quartz Debug: a) Quartz 2D extreme disabled; b) Automatic Beam Synchronization
2. turn off PB and unplug everything
3. remove battery
4. remove all memory modules (your 1GB RAM)
5. plug AC power
6. turn on PB ( beeps; white LED blinks)
7. turn off PB
8. reset PMU (my PB model: shiftctrl+altpower)
9. turn off PB
10. unplug AC power
11. install all memory modules
12. install battery
13. plug AC power
14. turn on PB and pray
Good luck.
i had everything back internal and external monitor it is a wonderful trick!!!
thanks yan pb15

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