Freeze during startup after SW update from 10.4 - 10.4.8

Question

After updating to 10.4.8, my machine would freeze during startup (at the gray screen with the apple and spinner) and give me the "Please restart your computer" message in a few languages.
I thought it might be a RAM issue, so I removed all third party RAM - same problem.
I replaced all of the RAM with RAM from another G5 that I know worked - same problem
I moved the HD from my G5 to another G5 that was working - same problem (I believe that eliminates the motherboard and any other components from being the problem).
I thought that the HD might be bad, so I replaced it with a brand new SATA drive, installed 10.4 and it worked perfectly, ran all of the SW updates (including the combined 10.4.8 update) and I get the same freezing again when I reboot.
Any suggestions are appriciated!

Answer 1

Hi Joe,
Welcome to the only place where you can get friendly advice.
Ok have you tried starting up from the installer / restore CD that came with the mac and run disk utility??
Try hardware test doing the extended test in a loop to try and find the base of the Kernel panic (thats what the "you need to restart your computer" image indicates)
For info and guidance on Kernel panics see:
http://docs.info.apple.com/article.html?artnum=106227
and trouble shooting info:
http://docs.info.apple.com/article.html?artnum=25392
for extensive advice on solving the kernel panics see:
http://www.thexlab.com/faqs/kernelpanics.html
Worst case senario it could be the G5 processors, make sure you have applecare; just in case it gets expensive!!