I only include these four components because my research so far has led me to believe these are the would-be culprits. After installing everything and rechecking all the connections i plugged it in and powered on the psu. i pushed the power button and the power button lit up for a brief moment and faded away. tried it again and nothing. flicked the power on the psu off and on and still nothing from the power button. after reading some troubleshooting guides i took out everything except the cpu and cpu heatsink fan and the computer powered on with the normal error codes for missing components. seated everything one at a time and followed with successful test powerups, even was able to run the bios with everything seated except the gpu. once i insert the gpu (made sure it was seated correctly and had power supply) the power button does nothing. wondering if the 750 isnt powerful enough or im not connecting the power right. or maybe the gpu is faulty. any help would be greatly appreciated. and sorry about the punctuation!