@mrmister Exact same problem, whether using either Benbox or Eleksmaker SW - USB is recognised, but neither the stepper motors nor the laser 'initialize' when DC power is input to the board from the (supplied) PSU. In the vid, I demonstrated using Benbox SW, because that's the "preferred option" from Banggood.
As for checking solder joints, this is a brand new (never yet used) device. If the board is faulty today, then I don't see why it would be unreasonable to expect it to be replaced, and before it causes further problems in the future. I'd also prefer that neither the mfr nor the vendor try blaming me for any attempted repair issues!