Ok, I just swapped the cpu modules and made sure to really to tighten the screws real hard.
And the G5 fires up again!

I'm writing this with my G5, yeah!

What I noticed it that the fans were blowing like hell when I boot into the bootmenu and while I'm in the firmware!?
This wasn't before, but when booting into MorphOS, the fans spins down.

Do I need to calibrate the fans?

I have the files "asd.2.6.3 (2005).dmg" and "ASD 2.5.8.dmg", but I can't burn them under MorphOS, right?
Does anyone have an .iso of these archives?
I found a dmgtoiso converter in Aminet, lets try it...

Lets see how long it last this time...

BTW:
The cpu modules look different from below!
Could it be that one cpu got burned?

G5_both_cpu_modules.jpg