If you press the reset button on the non-working board, does the LED on pin 13 (labelled "L") blink at all? Is the power jumper on the two pins closest to the USB connector? If you swap the ATmega168's between the boards, what happens?
If you press the reset button on the non-working board, does the LED on pin 13 (labelled "L") blink at all? Is the power jumper on the two pins closest to the USB connector? If you swap the ATmega168's between the boards, what happens?