jmagnus:
Yes, if there is no data on the SD card then that is the only way I know it failed. I have no clue how far it gets in the sketch.
The LED error code sounds like a good idea. Problem is I am a complete noob and I dont know how to do that or to check for other errors.
Do you have an LED on your Arduino? Or any unused output pins that you could use to connect an external LED? The 'blink' example is pretty much the first step in any Arduino learning curve and I find it hard to believe you're intending to debug an SD data logger if you don't know how to turn on an LED.