Since this post appears to be nearly exactly the same as another post on another site, I'll just copy and paste their accepted answer
They too added amin and user passwords as you describe.
Copy and paste about Secure Boot:
What happens if my new hardware isn’t trusted?
Your PC may not be able to boot. There are two kinds of problems that can occur:
The firmware may not trust the operating system, option ROM, driver, or app because it is not trusted by the Secure Boot database.
Some hardware requires keel-mode drivers that must be signed. Note: many older 32-bit (x86) drivers are not signed, because keel-mode driver signing is a recent requirement for Secure Boot. For more info, see Secure boot feature signing requirements for keel-mode drivers.
For more info, see Windows 8 with Secure Boot enabled may no longer boot after installing new hardware.
How can I add hardware or run software or operating systems that haven’t been trusted by my manufacturer?
You can check for software updates from Microsoft and/or the PC manufacturer.
You can contact your manufacturer to request new hardware or software to be added to the Secure Boot database.
For most PCs, you can disable Secure Boot through the PC’s BIOS. For more info, see Disabling Secure Boot.
For logo-certified Windows RT 8.1 and Windows RT PCs, Secure Boot is required to be configured so that it cannot be disabled. "
Did you try and install the drivers for your card? Check if there were any BIOS updates addressing the issue?
Worst case scenario, you can try and call ASUS and ask them to look into it, I don't see why they would purposefully make it an issue to put a good gpu in one of their higher end boards.
*I took a look at my Z87 version, and the secureboot stuff was greyed out as well, but I never set up any of those passwords either. I did, however, have the option of changing the OS type if I wanted. Not as sure what that is, but you might want to at least look into it. And again, calling ASUS Probably shouldnt hurt. I have a gigabyte gtx 760 and it worked just fine, so im not really sure why a 780 is giving trouble
http://www.tomshardware.co.uk/answers/id-2225322/asus-uefi-boot-utility-secure-boot.html
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