Cannot upload to Genuino uno

Hi,

I am new to Arduino and got my starter pack few days ago. I did my homework reading the manual, watched the tutorials and so on. I have the same problem as the other users which i cannot solve.

I have the right board selected (GENUINO UNO) The port seems fine (/dev/cu.usbmodemfd1421) I am using a macbook with OSX 10.11.5

Also i did a couple of things that you guys suggested in previous posts: Nothing is on the digital pins 0 and 1 (now is totally free of any jumper, shield etc - Totally naked except the USB cable).

I paste the error message even though many already did

Arduino: 1.6.9 (Mac OS X), Board: "Arduino/Genuino Uno"

Sketch uses 1,066 bytes (3%) of program storage space. Maximum is 32,256 bytes. Global variables use 9 bytes (0%) of dynamic memory, leaving 2,039 bytes for local variables. Maximum is 2,048 bytes. avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00 Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences.

I tried once another Arduino Uno, when I had practices at school, it worked well instantly after I plugged it to my Mac! It is strange to have this error now with my new Uno.

Hope somebody has a solution!

I also tried to burn bootloader but it replies me this

avrdude: usbdev_open(): did not find any USB device "usb" Error while burning bootloader.

I changed the Programmer to AVR ISP and it was burnt. After this, the upload works!