I’m new to this, but on my second laser due to the same issue. I can’t seem to get any laser working due to the “Port failed to open - Already in Use?” message. I started out with a Comgrow Comgo Z1, but returned it when I couldn’t get this working. I now have a OMTech B10 and am hitting the exact same issue. I’ve tested all of the cables, and those are fine.
Is there any solution to this? I found a similar post from August, but it was automatically closed due to no response for 30 days without a solution. I’ve tried installing older versions of Lightburn to no avail.
I’m kind of at a loss here and am about to return a second laser cutter.
Does anyone have any ideas?