Elffin
Bought a replacement motherboard... usbs fail to initiate drivers unless attached to my powered usb hub.
powered USB hubs can be an issue in themselves. I suggest you disconnect all USB, boot that way. then one by one add usb devices back in. it will take some time, but you may find the problem when you get to a point.
including connecting those devices up directly to the computer without using the hub. I realize you probably don't have enough ports, but try it without it.