@Cefalu

There is a guy on ebay who has some spare parts for these at reasonable prices. His ebay user is express_computer. Last I heard he had a complete set of working radiators and pumps.

I would swap the pumps around on your units first to make sure the problem follows the pump otherwise you may have a board issue or controller problem. If it follows the pump though you can just swap the unit and you're back off to the races.

You can also use regular water cooling equipment. I believe I read the dimensions of the water block screws match that of an Intel LGA1156. Most store bought water cooling setups will have a bracket to match that. You will probably need to come up with your own replacement screws though as the length required may be different. I recommend spring loaded screws. That way you get nice even pressure and that takes most of the guess work out of it. Also if you have custom loop water cooling equipment laying around those water blocks generally fit without much fuss. I started setting mine up that way before I sold but it was going to be so expensive I gave it up.

Incidentally the machines I sold are running great for the guy. He's happy and I'm happy they're gone. I get a little OCD when I can't make things work right so they had to go.