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9.1 freezes/crashes after install

Recently a mac user decided to try upgrading from 9.0.4 to 9.1 (to get to eventually 9.2.2), however after installation and a reboot the mac would totally freeze up at the exact same point, if the extensions are not loaded then it sometimes boots into the desktop however it will quickly afterwards either freeze up or crash.

We have tried wiping the machine and installing from scratch but the same still happens when trying to install 9.1, 9.0.4 works fine.

We have tried the following:

Wiping PRAM
Replacing the memory (and using just one dimm from a known working machine)
Installing on a second hard disk in the machine.

Has anyone got any other possible ideas?
It seems as though to me that perhaps the motherboard is at fault.

The OS ROM is 4.9.1.
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MarkCC
Asked:
MarkCC
1 Solution
 
Andrew DuffyTechnical Services CoordinatorCommented:
One more diagnostic you could try (and your troubleshooting thus far has been very good) is to put the hard disk in a different Mac and see if it does the same. If it doesn't and based on the fact you tried an alternate hard disk already, I'd say your suspicion about the motherboard is correct.
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bearcaCommented:
There are some (loosely documents) cases of multiprocessor G4s (Specifically dual 450's), that did not take kindly to the 9.1 update... If your machine is one of those, let me know, I'll dig up some of the old cases, and let you know of some workarounds you can try.
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MarkCCAuthor Commented:
Curiously enough it is a dual G4.
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MarkCCAuthor Commented:
We've since procured a Mac OS 9.2.2 cd and used that to get around the problem. (BTW)
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Computer101Commented:
PAQed with points refunded (125)

Computer101
EE Admin
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