Is my computer doesn't turn on at all when the USB 3.0 header is installed, what do I do? I need USB ports to work! It's not the mother board because I just get it RMA'd and the same thing was happening to thee other board
Try updating the bios. Sometimes that can help. If you already did I'm not sure what else could be the issue. Perhaps your usb header cable? See if you can replace that if bios update is not the issue.