I'm trying to upload a simple sketch to my Uno board but get this error message:
avrdude: stk500_recv(): programmer is not responding.
I have 5 Uno boards and 3 of them works fine so I guess it is something to do specifically with the two boards (which used to work) and not my system or cables.
I also did a loop-back test (http://forum.arduino.cc/index.php?topic=73748.0) on both of the boards where one worked fine and the other didn't echoed back.
I read about possible solutions for this problem in the following link but being new to arduino I couldn't figure out how to debug the problems or how to implement some of the solutions. Arduino Sketch upload issue - avrdude: stk500_recv(): programmer is not responding
Any help will be appreciated, thanks in advance.
edit: Tried using an Arduino as an AVR ISP but failed with both of the boards (https://www.arduino.cc/en/Tutorial/ArduinoISP)
