I bought a 2006 Mac Mini for $25 without a power supply. I read that it can run off 12v? How can I directly hook up 12v and run the Mac Mini without one of the very expensive 110w supplies (I'm wanting to directly hook up an ATX supply to the mini)?
The power supply can be found for less than "very expensive"
Using another supply is possible, I suppose. The tricky part will be the power connector plug. It's a little unusual.
And, I don't remember seeing the pin-out for that connector.
According to this - the adapter is 18.5vdc, although I suppose part of the output is going to be 12vdc.
But, you purchased an incomplete system, completing it with a cobbled-up connection may not be easy.
Have you found a source for the pin out? (Maybe you will be more successful that I have been)