Hey guys. I'm pretty exhausted at this point. We were getting kernal crashes and freeze ups on our powermac g5. Brought it into apple. They replaced the logic board, cpu's, and power supply. The issues still remained. We replaced the internal HD and reinstalled tiger fresh off the install DVD. While doing software updates we got crashes again. Zapped Pram,Did a disk repair. Problems still remain. Zapped P-Ram again. Still having problems on startup, and freezing once it actually does. Any idea what is left to replace that could be causing these issues?