ARC Pro

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#1   — Edited

Please check out the FAQ page at manufacturers website (EZ-Robot), there's information there that will help you: https://www.ez-robot.com/Tutorials/Trouble-Shooting.aspx#11

Is there a Red LED that lights up and stays on, when trying to move your robot? If so, check out the FAQ.

Check if the servos have an HDD or an HD label on them. The HDD servos won't twitch as they are digital, the older version will twitch on power up due to being analog servos.

If all else fails, contact the manufacturer for product support.