The 3.3 and 5 vdc rails provide logic power and the new processors and boards need a lot. The 12vdc line is used primarily for motors, ie: fans, hard drive spindle motors, etc. I just go by my primary concern, which is the 12vdc line as I used to run a lot of fans. I don't run as many fans as before, but I still use a lot of drives. I run U160 and U320 scsi drives and they require a lot of power. My old IBM drives needed 2.5 amps each at start up on the 12vdc line.
But, since your computer used to work before the water setup, and assuming that nothing else changed, then it should still work. The MCP600 pump only draws .75 amps or about two 120mm fans worth of power.
Has your system dried off enough to try a restart?
Try resetting the bios and unplug the hard drive.
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