Hello there! This is my first post. I was really enjoying my arduino UNO. I had a program loaded up that was working fine and then I unplugged it. When I plugged it back in the LCD display flashed and it would not show my text. It Will not upload a sketch anymore with the programmer is not responding error. I have tried hitting the reset button at various times and durations with little result. The loop back test works, I bought a new atmega328p with a bootloader already installed from adafruit and that didn't fix it either. Have checked cord, power adapter, etc.
When power is applied the green led turns on and the pin 13 led flashes 3 times and that is it.
No, nothing is connected to the arduino. I thought maybe that was problem- it is bare with a new chip in the socket. I could put the old one back in if necessary. The LCD works on another arduino I have so it isn't the problem.
That is a good idea about trying a new computer- did yours load sketches from that computer previously and then all of a sudden not? I am using a macbook pro with snow leopard 10.6X which worked fine previously, while I couldn't get it to work on my ASUS netbook, I did on a desktop pc. Will let you know.
