BTW, NebGen is the only scene file that I've come across that uses EEVEE instead of cycles. I've never used EEVEE for anything. I know absolutely nothing about it.
The only time my computer does that it's when I render a scene that is too much for it and it's crushed by its weight. Those beeping sounds it's almost like my computer is screaming and begin me to stop the pain, like pleeeeease dude it hurts too much! pleeease put a stop to it! So maybe that scene is so render intensive that even your good computer is not enough. So as Martin suggested, you should totally contact the developer of the addon and hopefully you don't get trialed for computer torture.
