Watercooling 101, you must test each card stock cooler and all, each one individually to prove it is not defective or doa before moving onto water. Personally I take it a step further and check asic %, do a quick overclock to scout the max clocks on air, etc. Then if the card checks out I move onto water.
Things got rushed because I'm headed to college 1,000 miles away next week. I normally test things on air first, but I got lazy and was in a rush at the same time. This is the fourth dead 79XX series card I've had to deal with. AMD is about to lose my business I'm tired of this.
Worst case scenario, I flip flop cards and put the dead card in the last PCI-e slot and run it for show, then RMA over my winter break. That way I can still CrossFire.