IBook G4 - Boots, then black screen - not a backlight issue

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

Markus:
Run Hardware test over DVD - Diagnostics all fine (Screen fine all the time, running through all diagnostics)
Your issues seems rather strange. From the statement quoted above, am I to understand that when you boot from the Apple Hardware Test disk you are able to see the tests running on the monitor, but when you attempt booting from the install disk you cannot see anything on the monitor? If that is so, it seems rather odd that you can boot from one and not from the other.
Mounted iBook drive as external drive with target mode - Other computer boots fine with iBook drive.
When you booted in FW-TDM which computer was Target and which was host? Sounds like you were able to use the iBook as the host computer with the other as Target. Try it the other way around with the iBook in Target Mode and the other computer as Host. Then launch Disk Utility and run Repair Disk on the iBook, selecting the iBook's HDD (manufacturer's ID) in the sidebar. Post back with results. If you are able to do so download and run SMART Utility - 2.0.2 for a reading on the HDD. I am not sure if it will work with the iBook as a FW drive, but it gives more information about the HDD than Disk Utility, which only gives a Verified or Failed status.
Good luck.
cornelius

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Welcome to Lenovo Community!
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Message was edited by: Jaygyver

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