Ok - I'm assuming that all of these computers are quite close together. If they aren't this isn't going to work (and any other way you do it will likely have flow problems with long tubing too).
I would run 2 PVC pipes of about 2" diameter along the back wall behind all of the computers, one for cool water to computers, one for hot water return. Spaced out every foot or two along each pipe have a quick-disconnect fitting.
Each computer would have just the block and some tubing coming out the back which would have the other end of the quick-disconnects on it. This way computers could be attached/detached from the system to work on them and such.
At one end of the 2 pipes they would be capped off. At the other end would be a single large (1000gph+) pump, a large rad with 2 or 4 120mm fans, and an old AT PSU to power the fans (unless you can get 120V fans for the rad). Plug the PSU (or 120V fans) and the pump all into a power-bar together and you can turn the entire cooling system on/off with the power-bar switch if you need to.
You should probably also have some type of pressure blow-off valve connecting the 2 pipes together at the capped end. So that if there are no computers plugged into the system that the pump can still circulate a little bit of coolant around.
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