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Hi, I'm new from Arduino. I'm facing a problem which is my Arduino Atmega 2560 on my desktop with a windows 7 64 bits.

This is just happening in my desktop, everything is working well with my laptop windows 7 32bits.

Just I don't understand why this is not working on the desktop.

I have chosen the Board to >>>  Arduino Mega 2560 or Mega ADK,
I have tried this several times including plugging in and out with the USB port.
The device manager is detected the Arduino >>> Arduino Mega 2560 R3 (COM3).

But it still not working at all and showing the codes below.

avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer



Can anyone help me ?