Blackscreen when "Booting from USB"

i'm installing my first hackintosh right now and when clicking "boot macos from USB" inside of clover I get a blackscreen. Upon selecting verbose mode and booting from USB again I get a few +'s in the top left corner but then it gets stuck again.

i hope someone can help me, thanks a lot :)

edit: specs (sorry for not including): gtx 1070, i5-7500, gigabyte ga-b250m-d3h

submitted by /u/UpdootMe
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