What happens if you select the file but instead of pressing the print button, go to the main screen and starting it there?
Otherwise make sure the file is saved to sd /USB stick fully, as it can be quite slow, so if you pull the USB etc out too early you'll have a gcode file that appears but won't function.
If it's attempting to print does it home the actuators (xyz axis) or does it restart as it's heating up bed? I think some of the examples doesn't use the heated bed so that could be the issue. Try checking connections etc, someone I believe had a simular issue and was cause by one of his cables being faulty so he swapped the head and bed cables.