To provide a perspective that will hopefully help you in this situation, you made the original post for help over the weekend, and then you just made a follow up post with the videos, followed immediately by an email asking for a return:
Hi i’m having a few issues with the board, and would like to return, not getting any answers on forum’s either Lightburn of yours,
Lacking time and inclination to be sorting the issues i’m having, return address please
Where to start…
Monday was a holiday in the USA. I am just back in the office now from the weekend.
We do not accept returns, as per the “all sales are final” in our Terms and Conditions that you agreed to when placing your order: https://cohesion3d.com/terms-conditions/ and your board is not defective.
You appear to have had “issues” with a different board also, as per your post on the LightBurn forum:
I do not think that it is a good life strategy for you to exercise your lack of patience on a small business that sold you product that is not defective, but probably just needs some configuration to make it work for your particular machine.
The main thing I see in your videos is that the board is trying to run pretty fast and that is resulting in the machine skipping steps (hence why there was a unpleasant sound and the rectangle in your first video did not end up at the bottom where it was supposed to).
You’ll need to adjust some settings, and this article may be a good starting point: Cohesion3D LaserBoard Larger Laser Machine Installation Guide
I’m happy to provide guidance, but we always encourage a tinkering and problem solving mindset to be able to work through things like this. If you are receptive and willing to work through things, great. Otherwise, I don’t think this will go well. Please give this all some thought and adjust accordingly.