It wasn't so long ago that all watercooling was "unapproved".
So yeah, there's probably just some RPM monitoring going on that's freaking out because it thinks a fan has died and is forcing a shutdown. Take a look though the manual for your board for exactly what the BIOS option is that is controlling that and turn it off. That should do it.
If by some chance the RPM monitoring is hard-wired, and can't be disabled in the BIOS, then you can probably bypass it just by hooking up any temperature controlled fan to the CPU fan headers on your board.
Do not meddle in the affairs of archers, for they are subtle and quick to anger.
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