Laser head not firing; seems a software connection issue

I am running xTool D1 Pro 20W, Lightburn 1.4.00, Windows 11 environment. I have done something to make the laser not fire (I don’t know what). Pressing the fire button lights indicates firing (red outline), laser does not fire, repressing fire does not unlight the fire button, neither does pressing the stop button. I have powered down the lases, closed out Lightburn, and restarted computer all at the same time. I thought it might be that particular program, but it does not follow that logic. Something about the laser head does not seem to be connecting with the rest of Lightburn software. Usually when the fire button is pressed, the laser head fan comes on, and it is not doing that. Any super Lightburn geniuses have any idea what to look at or do?

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