Maybe the LED on one computer is burned out.
If you mean that the Arduino IDE on one computer allows you to upload a sketch to the Arduino, while the other does not, I'd suspect that the FTDI driver is installed correctly on one, but not the other.
Maybe the LED on one computer is burned out.
If you mean that the Arduino IDE on one computer allows you to upload a sketch to the Arduino, while the other does not, I'd suspect that the FTDI driver is installed correctly on one, but not the other.