Hi! me again!
I erase Serial.begin(9600); and my external led (conected to 220 ohms) works ! ; After upload blink example( I upload sketch without disconect extrenal led connected to pin 0) then can't be able to upload sketch; I disconnected Arduino and led, after I finally can upload it.
However before it happed , leds tx rx on board isn't turn on ; only the led external connected(with blink sketch posted before on pin 0 without Serial.begin),now when sketch executes it happens; (led on board turn off , external led turn on) the same situation with pin !;
I'm scared to damage those pines .
PD I upload blink example again ,and and now when I connect external led on pin 0 turn on TX board led turn on too, before only external led turn on (was the reason for do this post )