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Well, maybe I'm over paranoid... But this system is a really big chunk of my disposable income - I can't afford to blow it up!
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First off of this is such an important and your only comp that you don't want damaged then drop the idea of messing with it at all. Get a good adjustable speed air cooloer and be done with it. Save up a few hundred and buy a mobo/ram/PS/vid card to test on. Don't need a case for this or expensive parts. If I was worried about breaking things I sure the hell wouldn't be testing blocks on my comp. Your going to break things when putting on and taking off blocks consistantly (testing in other words). Water will get dribbled, mobo's will die, ect.... Got a stack a dead mobo's to show for it over the last 3 years and expect at any moment to break things. I am willing to afford though. If you can't then don't mess with a perfectly good system.
But anyway water sensors are not to hard to make and customize.
http://hallbeng.jlab.org/firesafety/watersensor.htm
http://www.electronic-circuits-diagr...msimages/4.gif
www.google.com search Water Sensor Circuit and it will come up with ideas on it. You can also get a flow switch. If the flow stops you can set it up to trip the relay and shut it all down.