I can’t upload sketches to my Deicemilla. When connected to my Mac book or PC, the led on pin 13 won’t light when the reset button is pushed. An iDuino has the same problem but Stickduino will upload sketches. What could be the problem? I joined the grounds of the Arduino and 20v Wal Wort. Could this have fried the internal fuse? I changed the 168 chip without success.
Did you write the bootloader code to the replacement '168?