Stuck after Sierra boot drive was created

My specs: CPU: Core i7-4790k motherboard: ASRock Z97 Anniversary Edition LGA 1150 GPU: NVIDIA gtx 960 8gb RAM

So I've posted here before, but I ran into a lot of issues with my last attempt at making a hackintosh so I decided to start over. I made a slight mistake though, I formatted the USB I was using as a boot disk before I formatted the hard drive that Sierra was on, so I couldn't boot into Sierra (this is a known issue with my motherboard). But basically I followed this guide to get multibeast and Sierra on to my newly formatted boot drive and plugged it back into the computer, ran the Sierra setup, formatted the SSD from inside the setup and waited for Sierra to install. After it installed, I got the "Reboot and Select proper Boot device" error and no matter what USB drive I put the drive in, no matter what boot priority I have in my BIOS, I keep getting that same error message. Any help is greatly appreciated.