Computer submersed in water?

[13:02] Chruser: Speaking of which, I still want to put an old computer in deionized water and run it.
[13:02] Chruser: In theory, it should work.

I disagree. You can remove the ions from water, but the water itself will form ions by decomposing into hydrogen and hydroxide. The computer might even cause the release of hydrogen gas then ignite it