[G4] G4 mirror door POS OSX 10.3

[chip puller]

I am trying to repair a dual processor 867 mhz mirror door G4. It gets 
kernel panic even when booting from an OSX-DVD which I find, makes it 
difficult discovering the problem. Kernel panic happenes for no reason and I 
have zapped the pram, reformatted the HD, Replace the HD and installed new 
osx 10.3.  Last night I even downloaded and installed the boot rom software 
upgrade. The boot rom was 4.4.8f2 and I erased it and reinstalled the 
software. The computer rebooted and ran for about 2 minutes and KERNEL 
PANIC....   I took all of the ram out of the sockets and tried 1 stick in 
all 4 sockets and reseated the CPU daughterboard. This G4 is the first one I 
have not been able to fix and that bugs me to no end.
  any ideas ?
    Al