I need some help please.

I've had my Qidi for a few days and everything was going great. It's got about 20 hours of total time on it.

Today when I went to start a print, when the printer tried to home, it would just grind against the end-stop. I was able to verify that it's the X-stop by sending individual movement commands using Astroprint.

I ohmed out the X-cable and found the red wire was no-connect so I replaced the wire with the spare from the package. The new wire checks out fine.

The bad news is that this did not fix the problem. The LED comes on on the X end-stop when the carriage gets there, but it doesn't stop and keeps grinding. I guess the red wire is probably not used in this case and that was a red herring.

What else could it be? Which wires should be closing when the limit switch is hit? Does this sound like a motherboard problem?

What is the best way to contact Qidi tech support?

I could just ask Amazon for a replacement, but mechanically, my printer is excellent and I'd like to keep it.