FTDI Serial port fail

I'm running a iMac with Yosemite 10.10.5. I have a new Arduino Uno with USB port. And I'm running Arduino 1.6.5.

I connected the Arduino to a USB port on the Mac. The green power light lit up. The 13 light lights but is not flashing. So I went to File>Example>Basics>Blink to upload the sketch for the flashing light. I compiled the file without issue. And when I attempted to upload I received a serial port error. I went to Tools>Port to see what port was being used and the selection is grayed out, I can't even select it. So I checked to see which board was selected in the same Tools menu and I have Arduino/Genuino Uno selected.

After much research I found the site for the FTDI download. Downloaded and installed it, restarted the Mac. Still no joy. Oh, and I've attempted same on different USB ports as well.

Any suggestions or advice?

Update... I attempted the above sans uploading a new USB driver on my MacBook Pro; running 10.10.5 and using Arduino 1.6.3. I have Arduino Uno selected in Tools>Board, and Serial selected in Tools>Port. I get the following error: ...can't open device "/dev/cu.usbmodem1421" : No such file or directory.

Thanks,
Loch

A windows or linux computer should automatically locate the correct driver for an FTDI chip. Try on a win machine. It also tells you with an audio alert whether a USB device is recognized or not. If you think you have an FTDI chip, then it is not an UNO. If it is an UNO, then it has no FTDI chip. Does your "UNO" have a chip that says FTDI on it or not?

Okay thanks.

I've been doing some more reading. Firstly, no FTDI chip on the board. Second, when I plug in the board and boot up the IDE I go to Tools>Port>Serial Ports and nothing. From what I've been reading this action is suppose to bring up a menu of serial ports available.

Is this true? Am I supposed to see a menu to select the correct serial port?

Thanks,
Loch