Anet A8 board USB broken? I'm trying to connect my PC to my Anet A8 through Pronterface on Ubuntu.
But when I'm clicking on the &quot;connect&quot; button in Pronterface, all I see is &quot;Connecting ...&quot;.
What I did so far

added my user to the dialout group
tried to run it as root
tried different baudrates
switch to different USB cables
tried to install and run it on a different machine and different OS (Windows) with nearly the same result (additionally I see repeated lines with M105, but no response)

The printer itself works - I want to connect to it, to &quot;PID tune&quot; it, because I added a different fan duct.
How can I make sure the board isn't somewhat damaged, and its just my setup?
I have this printer and used this board many times over USB.
The genuine Arduino boards use the FTDI FT232RL to convert USB signals to UART signals.
The problem with these Arduino based clone boards is that they do not use the FTDI chips as these are too expensive. These boards use a CH340G chip which is a Chinese clone which requires a specific driver to be installed before you can communicate with the board:

Image shows a close-up of the CH340G chipset on the Anet A8 controller board.
When you bought the printer, the SD-card contained the driver that you need to install on your OS. I remember that this driver was for the Windows OS. However, you can download the driver for many platforms (Windows, Mac and Linux) directly from the manufacturer.