avrdude: stk500_getsync(): not in sync: resp=0x30

Using Arduino IDE 1.x
6

So you have 3 Arduino's and 2 PC's
All the Arduino's work with PC1 but only one does work with PC2
Correct?

  • try another cable
  • try another USB port of your PC if possible
  • reinstall the drivers (remove COMports from device manager)