So I checked out the ebay unit I got - one board was completely dead, no lights whatsoever. The PS showed the orange right-side light. Voltage 0 across the leads from it. The other one was working.
I pulled the cooling and put it on my 50% dead board, no go, still dead.
So I guess some of my chips are fried? I need to re-read what carman says above.

Anyway, I replaced my board with the good ebay board and the cooling system which came with it, all is well.

One odd thing - when I initially tried the ebay machine and noted the dead board,
I measure voltage across the dead unit and the working unit - as mentioned, the
dead was 0 but the working one was at 18+vDC ?!

I should have measured again after I got it all back together, but it took a long
time and I forgot. Will check it next time.

Also, I took your advice carman, I slathered the things in thermal paste, I forget what,
some decent stuff. They are running well, quite cool.