I think I fried my Pro Mini. I was trying to solder a wire to the analog 4 & 5 pins, which on the pro mini, are on the inside very near to the processor. Some solder got on one of the processors pins, I didn't catch this until after I tried to power it on. Nothing happened, no lights or anything turned on.
You would probably fry the voltage regulator if you'd have it powered for several minutes, but I don't think you could damage the processor by doing this.
Clean up the mess with some soldering wick and try again.