Minis spin at restart or shut down

I have 3 minis that just spin when you hit restart or shut down. You have to hard reboot... the old firmware update I found is not needed on that computer according to the computer. Running 10.4.11 on all. Any ideas?

Are these Intel Minis, or the older PPC G4 Minis?
What is the history of these particular Minis and how are they being used?

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    [email protected]

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