http://www.amazon.com/Presario-31092.../dp/B003ZTZMTC
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if it is the older one, the only reason that you can't is because it doesn't have a startup/shutdown controller. if you don't want the pc to startup/shutdown automatically, then there isn't a reason it won't work with a older mac mini.
the newer ones are a little different-- as you need to rewire the internals to accept the power..