Pismo PowerBook--no video

Hi all,
I have a Pismo PowerBook that has no video for both the internal display and any attached external displays. It seems to boot up just fine as I can hear the hard drive working and can even put the computer to sleep by pressing the power button followed by the "s" key.
I initially thought that this must be a problem with the logic board, so I ordered a replacement from ifixit.com and installed it. The new board produces exactly the same symptoms as before: no video from any source. Other than a dead replacement logic board, is there anything else that would cause this problem?
Thanks,
Dan

Dan, welcome to Apple Discussions.
I also have a Pismo, but haven't experienced this problem. Below is the text (for video) from Apple's Pismo Service Manual.
PowerBook (FireWire) Symptom Charts / Video –
Pixel(s) always on or off
1. A certain number of pixel anomalies are inherent in display
technology and vary by many factors, including type of
technology. If you suspect that the display contains an
abnormal number of anomalies, contact Apple Technical
Support.
Warning: Do not use a metal screwdriver to reseat the display cable
or shorting could result. Use a plastic or nylon tool.
Partial or full row of pixels is always on or always off
1. Check display cable connection.
2. In the U.S., contact Apple Technical Support.
3. Replace display cable (international only).
4. Replace display (international only).
5. Replace I/O logic board.
Display is very light or totally white
1. Verify display cable and inverter board cable connections to the I/O logic board.
2. Replace inverter board.
3. In the U.S., contact Apple Technical Support.
4. Replace display cable (international only).
5. Replace display (international only).
An external monitor connected to the computer shows no video
1. Verify external monitor has power.
2. Try different resolutions in the Monitors control panel.
3. Try another monitor cable and verify the video adapter has part number 590-1123 on the adapter.
4. Try another monitor.
5. Restart unit and reset PRAM.
6. Replace I/O logic board.
No display, but computer appears to operate correctly
1. Connect power adapter.
2. Adjust screen brightness using keyboard controls.
3. Verify display cable, inverter board, and I/O logic board connections.
4. Connect external, known-good monitor.
5. Verify inverter cable is properly connected.
6. Replace inverter cable.
7. Replace inverter board.
8. In the U.S., contact Apple Technical Support.
9. Replace display cable (international only).
10. Replace display (international only).
11. Replace I/O logic board.
An external monitor connected to the computer shows either horizontal or vertical rolling, or horizontal or vertical distortion
1. Try different resolutions in the Monitors control panel.
2. Verify monitor using another computer.
3. Try another video adapter and verify the video adapter has part number 590-1123 on it.
4. Replace I/O logic board.
Backlight doesn’t operate; screen is very dim
1. Adjust screen brightness setting.
2. Verify backlight cable connection is secure.
3. Check display cable and inverter board connections to the I/O logic board.
4. Verify inverter cable is properly connected and that cable is good.
5. Verify cables are not pinched or severed.
6. Replace inverter board.
7. In the U.S., contact Apple Technical Support.
8. Replace display (international only).
9. Replace I/O logic board.
I don't think it's a backlight or inverter problem because you could still get video out to an external monitor. Have you tried a PRAM zap? Could be the display cable or connector.
 Cheers, Tom

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