Here's my conundrum. Bought a new case, motherboard, Asus tug z270, g4600 cpu, new psu 750w. Connected it and only power light comes on, no fan or anything else. Returned the mobo and got an Asus Prime 270p.. same problem. I tried to short the prongs but nothing, no fans, just mobo lights up. What is happening? I'm beginning to take it personally.