Laser runs/emits light, but won’t engrave

My laser moves and emits light, but won’t engrave. I’m new to this and trying to figure out if it is a machine problem or a settings problem. I have engraved a few items, but it has done this twice now. I have owned it for 4 days. I was running at 1500 mm/m and 20% power. I attached my Lightburn settings.

First, make sure that you are in focus. Outside of that, speed and power are really the only controls you have to affect the burn. If you’re not making a mark then continue to slow down or increase power until a mark is achieved.

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