The story is both, amazing and chocking! I recently prepared my computer for watercooling, installed the CPU block on my i7-930, water blocks on my pair of 5970s (Gonna run 2 loops). Res and rads and all that. I still need a few fittings, so I'm completely unable to leak test it atm. Any who, as i was going into my room the other day, i heard this loud "crack" noise which i would say came from my computer which stands in the middle of my room. It worried me since I thought that i had tightened the screws of the GPU Waterblock too hard, could of been the floor, but i need to know.
So my question is: If i turn on the 6 fans from the 2 rads that i got, would i be able to cool my gpus and cpu enough without burning anything? (Not they got the waterblocks on them.
No. And I'm willing to bet the crack didn't come from your PC; at least from your waterblocks being too tight. They would likely just 'split' not make a loud 'crack'. It would also be VERY noticeable...pull the cards and look.
Again...No...don't turn it on without any coolant. It won't crack, but you will have burnt up components.