Just starting to use Pro mini .Loaded Arduino and have Blink working. Experimented with changing the flashing durations by editing and reloading the code, and that all works fine Now trying to change the flashing to a different pin from pin 13 by changing the "13" in the code to other pin numbers -tried 9,10,11and 12 but no joy. Powering and loading via FTDI Basic Breakout - 5V Help please! :-/
Answered my own question-dodgy bread board connection ::)
You are using an external LED/current limit resistor as you check out the other pins?