Laser won't come on while "cutting"

Hi, Im running an open frame Laser on an iMac (BigSur).
I can connect to the Laser and move the laser around. I can also “fire” the laser and it will light up so I can focus it.
when I hit the play button the laser head moves through the cut just like the preview but the Laser doesn’t come on.
Did I miss something?

Can’t really tell from the limited information you have supplied. Might drop the .lbrn2 file here for us to examine.

Generally speaking this is a configuration problem. Ensure you’ve gone though the Common Grbl Setup.

Good luck


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