Hardware :: IBook G4 Freezes Sporadically

I sent in a question, but I thought I would also post a thread in case anyone else might have some helpful suggestions.

I have an iBook G4, Tiger edition 10.4.11, 1.07 GHz, 768 MB DDR SDRAM.

My system sporadically freezes. Whenever it is moved (i.e. resituated on my lap, or from my lap to the table). Or if I leave it unattended for a period of time (i.e. downloading something, and walk away, by the time I come back it's froze if I am not constantly DOING something). Or if I try to access 3 or 4 applications at a single time.

Sometimes the freeze is a complete system freeze where nothing works or moves. Sometimes everything but the mouse freezes and I can still move the black arrow around. Sometimes it freezes and the little beach ball just keeps spinning, but is still mobile.

Sometimes after it freezes it will not restart. Instead it goes to a screen where it is all white with black flashing horizontal lines.

Sometimes a screen will pop up and say simply "You need to restart your computer. Please hold down the power key."

The only thing that I've found that fixes the screen is to take out the battery for 5-10 seconds and then it restarts immediately and perfectly.

I've done my "google" research and found that the early G4's (which mine is) have issues with the logic board and my Mac showed similar symptom's. It also said the "clamp" method temporarily fixes the problem. I tried this and it did nothing but readjust the black flashing lines. It did not fix the problem.

I've tried completely reformatting my hard drive. Starting from scratch. I installed an additional 512 MB of RAM on top of the 256 built-in. I ran Disk Utility to verify and repair permissions. I installed SMART reporter, and it says that my hard drive is fine. I ran ClamXav before reformatting my drive and it found nothing. I can't run it now, it freezes before it's finished every time