After removing the molex connector from my PSU power supply cord, I totally felt an long-awaited and much relieved non-noise polluted surroundings. Never understand why I had actually been swayed by the frantic panick of installing those super-loud high CFM produced Delta 80mm! I think I will not stick back the cord after enjoying these peace that was not available. Moreover, such non-functioning of casing exhaust and intake fans still did not cause any damage to my system, especially my CPU! which did have an cooler fan spinning.