I was using my YoraHome 6550-PRO today and everything was fine and burned a couple of projects. I then replaced a broken Y- axis limit switch. After replacing the switch I loaded a file to burn. Everything worked as normal, laser homed, moved to the start point I picked, the Frame button worked and the fire button worked. I clicked on the Start button after clicking on the project and nothing. No laser and no movement. ???
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When I have issues it ends up being that I was on the wrong COM port 
Once I change back to com port 3 everything is normal again. Another issue I have ran into is make sure your to be burned item is checked as output or it wont send the info to the laser. Hope your fix is that easy too!
I only have 1 com port so there is no problem with using the wrong one!! 
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