Won't boot into system (Black screen/ backlight on) -  faulty logic board?

My iBook g4 12" 1.33 Ghz doesn't want to boot into the system.
1. Start computer (chime sound)
2. Apple logo on grey background appears
3. Spinning wheel below Logo appears
4. Screen flicker, big vertical zigzag appears, black screen (backlight is on)
5. Shift key work (led on/off)
6. Num Lock key works (led on/off)
7. no responses with any other keys on keyboard
What I tried so far
1. Reset PRAM & NVRAM & PMU
2. Put original installer disc in, press C start from DVD - same as above happens
3. Boot from external hard drive with operating system over Firewire - same as above happens
4. Mounted iBook drive as external drive with target mode - Other computer boots fine with iBook drive
5. Attached an external monitor, which doesn't get a signal
6. Run Hardware test over DVD - Diagnostics all fine (Screen fine all the time, running through all diagnostics)
7. Tried pressing on the graphic chip, as some forum entries suggest - didn't change anything
8. Start in Safe mode with [shift key] - no indication that in safe mode, same faults
9. Start in [single-mode] (see image http://www.somethingonline.org/dl/pb/singlemode.jpg)
Don't know what else to try
Any help appreciated

By booting off of various other drives (optical and external HD) and getting the same results, I think you are correct in assuming that something else is wrong in the hardware. You might make a call to one of the places that repairs books (like the ones in back of MacWorld) and see what they charge to diagnose and repair. But it may just be time to get a new machine. I'm in the same place myself right now; my G4 iBook seems to be on the way out.

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