IBook crashing when moved, scr saver etc

Question

For some reason, our iBook G4/1.33ghz/512Mb/OS X 10.4.4 suddenly started to crash/kernel panic crash, 5-6 times per day, often at following occasions:
1) when battery saver screen saver (screen dimmed by power mgmt, not screen savers like Flurry) leads to a state where iBook cannot be waked, it's not only the screen that's dimmed - ie it's dead. No resets except hard reset will have any effect.
2) restarting (only 5 sec powerbutton reset will work) after such crash usually leads to a kernel panic. After restarting after the panic crash, it will often crash again.
3) kernel panic also happens in most cases when computer is moved, even if it's gently. Presumably after sudden motion sensor kicks in.
Furthermore:
- Apple Hardware test shows no errors (both several short and long tests).
- RAMs are Apple native and does not seem to be defective.
- PRAM and NVRAM have been resetted several times over.
- preference files relating to power management have been put in trash.

Answer 1

Hi Leemakiyama,
Welcome to Apple Discussions
Have you tried performing an Archive and Install? You can find more information about the Archive and Install feature in Knowledge Base Document 107120.
You might have corrupted software or hardware that is failing (or failed). I suggest Logging your Kernel Panic so that if you need to show it to Apple, you can. If you don't know how to log a Kernel Panic, Knowledge Base Document 106228 can help out. I also suggest posting bits of the system log (found in console) or crash log (the specific application can also be found in console) and posting it here. That way we might be able to determine what might be going on. Do you have anything connected to your iBook when this happens? You said your iBook crashes when moved, how so? Does it crash if you move the display? You might want to bring your iBook to your local Apple Store/Reseller.
I hope that helps,
Jon