Construction and wiring of my machine is complete, I think. During installation of Arduino/Marlin firmware, everything reported OK, success, complete, etc. The first sign of trouble is that commands to home the hotend to X, Y and Z were all ignored.
First thought: the wires. But the lights on the board flash blue and green, uploading the 'blink' sketch works gets the blinking just fine. The software is talking to the board. No way did I mix up the plug connectors for the motors or the endstops, or if I did I suspect they would go crazy. During the attempt at moving the hotend, nothing was against an endstop. In fact, Arduino truthfully told me nothing was against an endstop.
Arduino says only COM 3 is available, and that it's tied to an Arduino Mega ADK. More success. But when I ask it for information about the board itself, it replies: BN: Unknown board VID: 0403 PID: 6001.
Windows 10 says that the driver for COM 3 (actually, all drivers for anything) is up-to-date, and that the device on COM 3 is working properly -- but insists that it's an unknown device.
The board is an MKS Gen v1.4 and the USB chip is an FT232R, if that makes a difference.
Can anyone help with this?