So i just watched this video
And i found it quite amusing how he's really thinking his system is setup correctly and the fact that he even powered up the whole system without running any leaktests at all.
TTL did a vid showing how he does it, i think it was ORCA, and he did not start the pump till his system was primed. the pump sounded happy lol well compared to that guys omg thats was bad.
i seen the glowing rog logo and thought aw naw he dih'ent then i seen the 24pin and was like aw crap he did. that processor had zero cooling for a good length of time.
you just unplug the motherboard then connect the green cable (in 24 pin) to any black (ground) with a piece of wire, that will start the PSU and the pump/fans without any power going to the motherboard. If it leaks nothing is damaged.