G4 iBook works in Safe Mode, but not in regular mode (stuck on blue screen)

14" iBook G4 1.2GHz with 1 gig of RAM.
I recently had an issue with this machine in that the image on the screen would freeze but the cursor would be able to move around. This was narrowed down to an issue with the logic board. I wanted something a little more permanent than a shim, so I sent the board in to have it reballed.
After installing the maching back into my iBook, it seemed to work fine until I applied a software update to the machine.
It was then that I got to experience the first of many kernel panics.
Restarting at different times always brought me to the dialog box which states that the machine needed to be restarted in multiple languages.
Running the Apple Hardware Test off my install disks yielded this error code: 2ATI/2/4:113-xxxxx-125
I have no idea what that means. I do know that just before I got the results of the test, the screen changed to all kinds of colors. It was only for a few seconds and then the results (with the error code) were displayed.
Still, not sure what to do next, I tried resetting the PRAM. I also tried resetting the NVRAM.
I also tried booting up into Safe Mode which actually worked. There were no issues with the machine and everything seemed to be working fine.
When I tried to restart the machine in regular mode, I'm taken to the infamous blue screen and the machine just stays there. When I let the machine stay off overnight, it booted up normal, but after applying the software update, the machine was in kernel panic again.
I've tried running fsck, but nothing changes.
I'm still not sure why it seems to work in Safe Mode but not in regular mode.
I'd appreciate any suggestions or ideas.

Hi,
A couple of the things that are disabled in safe mode are AirPort and non Apple startup items. The easiest thing for you to test is the AirPort card. Shut down and remove the AE card under the keyboard. See if it starts. If it does your AE card is bad. If not, start in safe mode and go to System Preferences>Accounts>youraccount and disable all non Apple startup (LOgin) items by clicking on them and then the minus sign. Restart normally and see if it will start.
John

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