Frustration starting to rear its ugly head.Still no sawdust! Here is what I've done: after turning jog to incremental - 1) turned off all power and disconnected all leads. Results - same issue 2) Gone into GRBL (finally figured how to do that - small victory) and reset z travel to 1200 Results - would go down but not any higher. 3) Said to myself...I'm smarter than this. Changed direction for z to travel result - got upward movement but no down ward movement. 4) Reset machine zero result - none I could see. 5) Measured temp in shop...104 F Results- tried to hurry a little, just got tired sooner. 6) Loving wife told me her temp was rising. Said maybe I should have put my money into sewing. At least I could do that inside. I am ready for some really helpful advice as to how to make this thing do something predictably intentional.