Computer boots, screen remains black

Hi there,
My iBook G4 14'' boots (hear the HD), but the screen stays black (I have a powerbook G4 with the same problem). Tried resetting the PRAM (http://support.apple.com/kb/HT1379) and PMU (http://support.apple.com/kb/HT1431), but no difference. At one stage I saw RED, BLUE, GREEN etc screen (I assume the screen is still ok)
Connected and external screen, also blank.
Made a firewire connection with my MacBooks and see the harddisk and it is working fine.
Checked for viruses (saw a message on that) nothing found.
What else can I do? Anny suggestions?
Victor

I have the same machine and have never heard of this happening to this specific model. Other machines known to have this problem were usually caused by a faulty logic board. I'm sorry I don't have any ideas what you can try other than the basics:
Attempt to boot the machine from the #1 installation disk
You've already reset the PRAM
You could try a disk repair using the Target disk mode, assuming the target machine is running the same OS.
Does there look like there's any damage or corrosion in the area of the hinges? That's probably not easy to determine without taking it apart. Do you remember anything about when it started? Had you upgraded the OS or added more RAM or changed a drive?

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