Nope, not so much as a character in the serial connection (works on spare fine).

When I measure the DC voltage between ground and one of the two exposed pins in the corner by the power adapter, I get 0 volts (this is the pin I've used on another unit for a fan).

When I measure between ground and the power adapter itself, I get 12V (the part that is soldered to the board where the adapter plugs into).

So the failure is after the power plug and before the pin next to the black square component in the same corner as the power. There's a few other parts in that same corner but I'm at a loss as how to check them...