When setting up the metal material the Voronoi only output black
Sorry about the choppy video
Thanks for taking the time to make a video! I'm not 100% sure what's going wrong with the voronoi node...would you mind posting a download link for your .blend file so I can take a closer look? Best way to do this is by uploading your .blend to Dropbox, Google Drive, Mega, or equivalent file hosting service then copy + pasting the share link here.
Could you provide the version where the Color output of the Voronoi gives black, like in the video.
Or just a screenshot of the complete nodetree, when that is happening.
The Voronoi Node just works, so it's either the way it's connected, or you have a broken Blender version, or it's your graphics card (driver up to date?)