You did set it to Disk mode, right? Shift+COM and then the big 3?
Perhaps try a different cable in case the one you’re using is up the spout. Also, if you have one, try a different USB port. Failing that, try a different computer (or friend / colleague’s computer)?
But you're absolutely right to ask that question !
It worked once before
Does your OP-1 show up as a Midi device when not in Disk mode?
If if doesn’t charge either then maybe your Connector Board is broken. Or something else but I’m keeping my fingers crossed for you that it’s just the board.
If it is new, you might want to return it. Is it in a state now where you can’t even use it normally? Like, after the reformat it doesn’t boot to anything?