My Harbor Freight 44991 Mini Mill stooped working on me. I was milling slots in 6061 and the head just slowed down and stopped. Now it will not start up again. When this happened, I'd just finished a cut and was lowering the head for the next pass. The mill is about 6 months old. I've been using 6-8 hours per week since I got it. Mostly milling or drilling into AL. Here's what I've seen/checked so far: The green power light comes on The amber fault light is not on The fuse is good I tested the potentiometer with an ohm meter. The amount of resistance varies as I move the knob. But I've never tested one of these before so I don't know if it's changing by the correct amount. I looked at the controller board. Everything looks good. No capacitors or resisters appear blown or swelled. All the connections appear good. No wires are loose, broken or frayed. The only issue I've ever noticed before (other than busting gears when I forget to lock the head in place) is that yesterday I turned it off but the head continued to slowly turn. I turned it back on and off and then the head stopped. I used it for several hours last night and this happened twice. I used it for less than a half hour this morning and this did not occur. Any ideas on what I can check next?