Dell Optiplex 980, Mac OS Sierra, get a "forbidden" sign after clover...

Hey there!

I'm currently trying to install OS X Sierra in a Dell Optiplex 980, with an i3 530 and a GT 710, following this tutorial: https://www.youtube.com/watch?v=59d8vBhQgmU&t=5s

However, after the clover section, all I get is a black screen with a "forbidden" sign.

First time doing this. Also, I don't have an original Mac. Can I get a little help here on what might be wrong?

Thanks :D

submitted by /u/jpb18
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