G4 MDD won't power on...tried all the basics....is it the power supply?

Put a new battery in, unplugged-replugged, depressed PMU reset...said a couple incantations...nothin....not a spark. How certain can I be that it's the power supply? If it is that, where can I get another one, and are they costly...how hard to install?

Japamac's MDD PSU test page:
http://www.jcsenterprises.com/Japamacs_Page/Blog/D275729F-09DA-4FBB-96B3-BEEEB2C 04619.html
They can be costly. $100 or so used on eBay. Not very difficult to install, though.
An interesting ATX mod using the MDD's PSU case:
http://www.youtube.com/watch?v=wEzbl3eJIro

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