Can't boot from usb - 'An operating system has not found'

Hi guys,

I have a problem with 'An operating system has not found' when I try to boot Sierra installation from USB. I tried almost everything so far and it seems that I need help from somebody smarter than me.

Long story short: Couple days ago I sucessfully installed Sierra on my HDD drive. However there were some problems with Multibeast installation and after reboot MacOS didn't load anymore. So I format my HDD drive and created new bootable USB with Unibeast (UEFI) to start process from the beggining.

So I put USB into my computer and tried boot from it but I get 'An operating system has not found' Right now I have 2 disk - One SSD with Windows on it and HDD where I wanted to set up hackintosh.

I look into BIOS to find any problem with settings and there is one thing that i bothering me.. Namely in Boot option #2 & #3 I see 'Mac OS X' even though there is no any MacOS system on my drives right now..

What should I do at this point? Is there a problem with drives or with USB itself?

Has anybody encountered similar situation?

My Mobo is: Gigabyte GA-B85M-D3H