UEFI USB drive gone after installing

So I installed MacOS Sierra on my HDD from a usb drive (+clover) and restarted the PC afterwards. This is where I'm stuck. I just can't find the UEFI usb drive in the boot-menu anymore. There's a non-UEFI usb drive though, but there's no option to boot MacOS from the HDD (just install from usb drive) in the clover-menu.

Anyone got an idea what to do now?

Specs: Intel Xeon E3 1231v3 Gigabyte GA-H97N-WIFI

submitted by /u/IanRawz
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