I would like confirmation that the board has faulted, or advice as to what may have caused a fault or is causing this board to fail to communicate.
An addition to answer your question re com port.
The new board opens a device driver called: Freetronics 16U2 USB (COM9)
The Red LED reflects the state of D13 which i am using, The blue LED stays on but no other LEDs show at all.
Only when uploading the Green and Yellow LEDS show. Arduino Software automatically options to COM9.
The failed board opens a device driver called: Freetronics 16U2 USB (COM3) when connected.
As mentioned the RED D13 LED shows red then fades away. The blue LED stays on but no other LEDs show at all.
When uploading the Green and Yellow LEDS do not show. And the Arduino software options to COM3 and says "problem uploading to board" copied error report is:
Arduino: 1.6.6 (Windows 10), Board: "Arduino/Genuino Uno"
Sketch uses 13,058 bytes (40%) of program storage space. Maximum is 32,256 bytes.
Global variables use 653 bytes (31%) of dynamic memory, leaving 1,395 bytes for local variables. Maximum is 2,048 bytes.
avrdude: ser_open(): can't open device "\\.\COM9": The system cannot find the file specified.
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload
This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.