yep I have also tried to control the Laser via my buisness Notebook and I have tried to control it with the Laser GBRL software. But alle these options showed the same result.
I've checked all the connection cables+the power supply+the USB cable; all work fine.
So in my eyes there's only the Arduino/Servo modules/main circuit board responsible for this error.
All the visible solder joints are good.
I don't know where to search for the mistake..