Grey screen on startup - verbose mode:"We are hanging here..."! Please help

Dear everybody!
I'm cross-posting from the iBook forum, because I found some helpful posts over here after posting my problem there. I hope someone can help with these NEWS:
Here´s the short version:
Two days ago freeze during dragging a pdf to a USB storage. I shut down all other apps, then also finder, iBook becme unresponsive, so I shut it down with the power button. Since then, I permanently get the grey screen with four language "You need to restart your computer..." on normal startup, no problems starting in safe mode, but then some other strange things happen (e.g. no volume adjustable, no speakers and no mic in sound prefs).
AHT from original disc: no problems found
Tried Command S during startup with fsck -fy, same problem on reboot.
Tried Verbose mode, below is the very interesting last lines:
Latest stack backtrace for cpu 0:
Backtrace:
0x000954F8 0x00095BF8 0x00026898 0x0028D204 0x00296090 0x0029585C 0x0029929C 0x00292520
0x00297790 0x00297C24 0x002ABDB8 0x000ABD30 0x02461200
Proceeding back via exception chain:
Exception state (sv=0x3154D500)
PC=0x9002FD20; MSR=0x0200F030; DAR=0x0007B39E; DSISR=0x00002C1B; LR=0x9002F95C; R1=0xBFFFF8F0; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC
panic: We are hanging here...
Am I having a kernel panic? If yes, why does the console panic log not state any panic since more than a year? What's my next step?
Thanks for any useful ideas in advance!
Keywan

As for now, only thing that helped was an archive and install with preserve user settings. Seems after the reinstall of 10.4. everything that was weird has become normal again. I hope very much this state stays on for a while - or ever!
A comment to everybody: with problems that are common you get a lot of help from friendly users in here, but if like in my situation things get a bit more uncommon than the usual querks and troubles your bound to go through a whole workflow of tests and algorithms - i did learn some new things but eventually I had to go for the ultimate - the reinstall (of course, erase and install would have been more work.) and it's frustrating not to find out how it came to this problem. I wish I could nail it down to something I did mistakenly - i guess I'll find out next time.
THANKS THOUGH to those who replied.
Keywan

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