If your Arduino MKR1000 doesn't run it's program when you power-up or press the restart button, and you're using the serial display, change the following:

If you have:

  while (!Serial) {
      ; // wait for serial port to connect. Needed for native USB port only
  }

try changing it to:

  while (!Serial) {
    delay(1000);
    ; // wait for serial port to connect. Needed for native USB port only
  }

If this doesn't work, simply remove (or coment out) those three lines.

My arduino program would only run immediately after I uploaded the program. Pressing the reset button or disconnecting the USB and reconnecting the power didn't restart the program. Adding the 10 millisecond delay solved the problem.