Hyper-V Copy VM : blinking point on boot

Today i needed another dev VM(SharePoint 2013), i wanted to copy my 2016 VM and reinstall SharePoint, without having to install sql and AD again.

I copied the vhdx and created a new VM based on it.

When i started it a black screen with a blinking point comes

 

Solution :

I figured out that to be able to copy vhdx you will start thenew one with Generation2(thirs step when you configure your new VM)