Use a separate PSU to power the pump and fill her up. Use de-ionised/distilled water with a biocide for ultra low maintenance and minimal conductivity risk.
It'll be fine! Nothing is powered up besides the pump and there's no risk of damage if anything was to leak anyway.
If anything does leak, sort the leak out and test again. Clean up everything you can see and leave it a day or so before powering it on.
You can also do a test POST to make sure your build is working without any fluid. Just don't leave it running for too long or your CPU will thermal shutdown.
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