I have bought a Arduino Diecimila with pre-programmed. But during last week, the bootloader is corrupted.
I have make a parallel program myself and I program the bootloader into my Arduino. I found that, when I try to use USB to download my sketch into Aruduino, it is not responding! I have to press RESET button, so that I only can programmed sketch in.
Can anyone please tell me what is going wrong?