Hello!
I found the problem..... I have a extra keyboard and mouse (Wireless Logitech) on usb connected to my pc.
When I unplug the receiver, the pc is starting perfectly.
So it seems as if the bios update F10 has caused a problem with that specific usb device (have other usb devices connected, and no problems with them)
This usb device is already connected to my pc for a year now, and only now after updating BIOS F10 it is a problem.
After booting to windows i can reconnect the usb device and it works,until i reboot my pc, it hangs until i remove the usb receiver....
Nice

Hope this helps if someone has the same problem.