Error Message: "avrdude: stk500_getsync(): not in sync: resp=0x0"

Development Tools IDE 1.x
2

Has it ever worked? -- Or, are you trying to get it to work for the first time.

What version of the IDE (1.0.2?)

Is it a new Uno "R3" (says on the board)?

I haven't seen this problem in a while but back when I did it was either a driver install problem (shouldn't be a problem with the newest boards), or just a Windows/Usb issue, which needed something like:

  1. Unplug Arduino from USB.
  2. Exit Arduino IDE.
  3. Wait until the device doesn't show up any more in Windows (5-10 seconds, depending how fast the computer is)
  4. Plug the board back in, wait for the device to show up in Windows.
  5. Launch the Arduino IDE.
  6. Try uploading.

And/or try PC reboot between steps 3 and 4.

Good luck!
John