So I have a Crosshair V formula -Z with a 9590. Seems I got it narrowed down to my USB 3.0 ports on the I/O. Any time I have anything plugged into one of the USB 3.0 ports I get boot hang with the Q-Code 66. Unplug device and it boots without issue. ...

So the only thing that I have changed in my system is I have moved out my 500 and 320 gb HHD, and replaced with two 2TB green drives.For storage (since I'm thinking this has something to do with it)1x 500GB Samsung SSD1x 120GB Samsung SSD1x 5TB WD HD...