Wow~! I guess is not only me with the problem!!!
Try powering up outside of the case... mine did boot it and pass the usb check, entering to the bios... And see if work... then please post your result...
If boot, do this:
- Put in your case.
- Put all the screws except the one i have market with yellow circle in the next picture.
I don't know the reason... is not for shortening because i already tried putting a washer in all the holes... in the back and in the front with same result, no pass USB Check.
Maybe when you screw all, the mobo get bowed... who knows...

But it work to me that way.
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