digitalWrite(LED, HIGH);
Your LED is connected to pin 13. An a 328-based Arduino, that is one of the SPI pins. You can NOT use this pin for other things, since the SD shield uses SPI to communicate with the Arduino.
digitalWrite(LED, HIGH);
Your LED is connected to pin 13. An a 328-based Arduino, that is one of the SPI pins. You can NOT use this pin for other things, since the SD shield uses SPI to communicate with the Arduino.