CrossRoads:
Please post your schematic/wiring as well.You're missing this statement for the fan pin:
pinMode(ledPin,OUTPUT);Am surprised it ever turned on; writing the pin hi/lo here
digitalWrite(fan,HIGH);
delay(500);
digitalWrite(fan,LOW);
only enables/disables the internal pullup resistor. I don't see anything that talks about a buzzer.
With today's more efficient LEDs even the small amount of current that the input pin internal pull-up resistor can provide will be seen in most leds as he enables and disables the pull-up in the sketch. Try it sometime.