Black screen (loses hdmi connection) after booting??

Hey Guys!

This is a brand new build, I installed the system from the USB to the main drive. After this I restarted the computer and after the apple logo appears my screen goes black saying that it lost the HDMI connection.

Any clue what might be causing this and how to fix it?

Huge thanks !!

You should read the rules, in particular the one regarding profiles.