I"m really new to cnc, my background has been in photography I have a mini cnc router engraver that I would like to use for art projects, I cant seem to get a grasp on how to home the machine, there are no yellow lights when I hit the home switches, when i reference all the z axis is the only one that turns green the y moves to the bottom of the table, but doesn' t back off, the x axis does not move at all towards home. I assume that because i cant do this simple thing, it makes it hard for anything else to go smoothely. Also, when positioning a piece on the table and zeroing everything out why is it not possible to start from that point. could really use a little help!!!!!!!!!!