On my first install of a MCW5000A I neglected to tighten one of the worm clamps enough, it didn't leak untill I put it into my system. I turned on the pump, neglected to check for leaks, turned on the computer, and for two weeks my computer was down.
The victim was either my Barton 2500+ (that ran at 2253MHz on air with normal voltage) or my Abit NF7-S, I couldn't tell.
By the grace of a certain Diety, (God) after two weeks of trying to start the computer (three times a day, all ending in failure) the computer started fine, and still works now.
The situation could have been used as the base for a geek sitcom. The geek breaks his computer, his real life friends see this and he says the problem is the CPU failed, not wanting the truth to be known. He suspects the problem is the MB, but thinks that the warrenty has expired as he didn't read the small print. (he thinks it is a one month warrenty when it is a one year warrenty) The CPU goes out to be RMAed, but comes back with a note saying "no problem found." geek tries to start his computer, but it fails. His real life friends come over and say, "Start the computer, we want to do some computing and CPUing." The geek proceeds to make a big show of inserting the CPU and installing the cooler, presses the power button, and the computer starts normally.
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But I learned from my mistake, and I plan on reinstalling the WC sometime within a week.