Everytime i try to upload a new program to my Arduino Mega 2560 i have this message :avrdude: Version 5.4-arduino, compiled on Oct 9 2007 at 11:20:31
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
System wide configuration file is "/Applications/Arduino/0020/Arduino.app/Contents/Resources/Java/hardware/tools/avr/etc/avrdude.conf"
User configuration file is "/Users/AirClem/.avrduderc"
User configuration file does not exist or is not a regular file, skipping
Using Port : /dev/cu.usbmodem1411
Using Programmer : stk500v2
Overriding Baud Rate : 115200
avrdude: Send: . [1b] .  .  .  . [0e] .  . 
avrdude: ser_recv(): programmer is not responding
avrdude: stk500_2_ReceiveMessage(): timeout
I run on Mac OS 10.8 and i have no problem to upload programs on my arduino UNO.
Does anyone know what is the problem ?