Hi Antiapplekid ,
I have had this HP document in my collection , only I wasn't able to find it.
Did again research , and here it is:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03653226&cc=sr&dlc=en&lc=en
This is all about secure boot in win8 , hope it will help you.
Another tipp - chech if your Bios see your USB as another HD , and sett it as a first HD.
All the best!!!
Dindin
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