hello:) i have ga-z68p ds3 motherboard, ram 1600mhz 12 gb, power 600 watt, cpu i7 2600 3.4 , i have 2 hdd's 2tb & 2tb. video card is nvidia geforce gt 630 1 gb, system is mountain lion 10.8.5. i have problem my computer work's very slow and i think which peace & where is problem. i think power...