04 Servo - "Fits and Starts" light?

[KatieK2]

Just a bit of clarification on the servo lesson (04), the troubleshooting section "Fits and Starts" describes a blinking light on the Arduino board, but no (or very sporadic servo movement). Am I correct in assuming that the instructions mean that the On LED would be lit, and that the TX LED would be flashing. Or is there a low-voltage LED or pattern that I should be looking for?

[AnnaGerber]

What I've seen is the Arduino resets constantly, so the "on" LED flashes on and off