USB Serial port not recognized Have both an Arduino Uno R3 and a Blend Micro that I have used to prototype a number of projects. Just got a new MacBook Pro and cannot get it to recognize the boards through the USB serial port.

I am using the same USB cable as before so I know it is not power only.

Have tried both USB ports. Have also tried them with other devices, so I know they work.

I have tried installing both the FTDI and CH34x drivers (both the older and the new signed one).

Don't know what to try next... any help?
I have an Arduino Uno which works on my Mac running 10.11.3 this uses the Serial Port /dev/cu.usbmodemFA131.

It is 18 months since I installed this (on a previous OS) and I can't recall whether I had to install a driver

ioreg -p IOUSB shows this as

  | | +-o IOUSBHostDevice@fa130000  &lt;class AppleUSBDevice, id 0x100000955, registered, matched, active, busy 0 (40 ms), retain 13&gt;


system_profiler SPUSBDataType shows this as:-
            Communication Device:

          Product ID: 0x0043
          Vendor ID: 0x2341
          Version: 0.01
          Serial Number: 5543434373335120A2B0
          Speed: Up to 12 Mb/sec
          Manufacturer: Arduino (www.arduino.cc)
          Location ID: 0xfa130000 / 3
          Current Available (mA): 1000
          Current Required (mA): 100
          Extra Operating Current (mA): 0