For Windows 8/8.1 you would want UEFI boot enabled in BIOS. Also there's a menu item in the BIOS that lets you select which operating system you'll be using. Can you verify it's set to Windows 8.1?
In Boot order on main page, UEFI boot is checked and Windows 8.X is selected in Boot configuration/UEFI boot pane.
The USB boot dongle is #1 in the UEFI boot priority, however the SSD is not shown (I'm not sure if its supposed to either).
ChrisinNorway, would you please try doing a low level format on the drive where you are going to install the operating system?
You may want to check if you need a BIOS update.
I have "zero'ed" out the whole disk as described using killdisk http://www.intel.com/support/ssdc/hpssd/sb/CS-032319.htm
My existing computer had no problem creating MBR/volums/partitions before the low level format.
The same problem occurs, bios shows the disc, while the OS installation comes with no drives. (win 8.1 enterprise edition). I also tried making a new bootable usb with a different ISO experiencing the same result (both enterprise).
As stated in first post, i updated BIOS manually now using Bios version: FYBT10H.86A.0028.2014.0306.1727 as in the picture below.
Thanks! Seems like the new Bios release helped, as the march release could not allocate the disk.
Excellent!! I'm glad to know it worked.