IBook G4 - Black screen in open firmware

Hi, i have a strange problem with my iBook G4.
When switched on it chimes and starts loading but the screen is completely black (not no backlight but completely black). In otherwords it does not show the grey screen or apple logo.
Once the OS boots the blue screen comes up and everything works perfectly.
So the problem is that anything before the actual OS loads is black. That means the grey screen with apple logo, open firmware and the drive selection screen (if you boot holding ALT/OPT) are all black.
I have tried resetting the PMU, Pram and blindly (with black screen) in open firmware did reset-nram and reset-all but nothing changed.
It is a late 2004 iBook G4 1.2Ghz with 512MB ram, 30GB HD and OSX Leopard 10.5.8.

This is a strange one, isn't it?
I'd count my lucky stars that it will boot into the OS, and I'd be saving up for a new MacBook Pro (or used MacBook).
I'm going to kick this one around with some of the gang in the Lounge and see if any of them have any ideas about what may be causing this.
Good luck with it.

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Message was edited by: antony chen

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*"I get the blue screen with a question marked box."*
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MemTest
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