my smartdesk core won't move up or down when i press the buttons, just beeps once. it's plugged in.

Diagnosis

The single beep accompanying a failure to move on an Autonomous SmartDesk Core typically indicates a "Height Limit Lockout" or a logic error in the control box. This happens when the internal sensors believe the desk has reached its maximum or minimum physical extension, or when the control board has lost its calibration reference point. Essentially, the desk is triggering a safety override to prevent the motors from attempting to push the frame beyond its mechanical limits, which would otherwise strip the gears or burn out the motor. You can confirm this is a logic error rather than a power failure because the keypad is still responsive (beeping), meaning the 12V/24V power supply is functioning. If the desk was completely dead, you would see no lights and hear no sound. This specific "single beep" symptom is common after a power surge or if the desk was accidentally pushed manually while the power was off, causing the control box to lose track of the actual leg positions relative to the programmed limits.

How to Fix It

To resolve this, you must perform a Hard Reset to recalibrate the Z-axis of the lifting columns. Follow these steps exactly:

1. Clear all items from underneath the desk to ensure there are no obstructions that could trigger a collision sensor during the reset.
2. Press and hold the "Down" arrow button. Continue holding it even though the desk isn't moving.
3. Keep the button depressed for approximately 10 to 15 seconds. You are waiting for a distinct, long beep (different from the short error beep) and for the digital display to show "RST" or simply flash.
4. Once you hear the long beep, release the button for one second, then immediately press and hold the "Down" arrow again.
5. The desk will now begin a slow descent. It will travel to the absolute lowest physical point of the frame. Do not let go of the button until the desk has completely stopped moving on its own.
6. Once the desk reaches the bottom and stops, release the button. The control box has now re-indexed the "Zero" position.
7. Test the movement by pressing the "Up" arrow to ensure the lockout has been cleared.

If That Didn't Work

• Check the Cable Seating: Crawl under the desk and locate the control box (the black plastic hub). Unplug the power cable and the cables leading to the motors. Inspect the pins for any bends or dust. Re-seat them firmly until you hear a click. A loose connection to one of the two motors will trigger a safety beep and prevent movement to avoid an uneven tilt.
• Power Cycle (Cold Boot): Unplug the desk from the wall outlet and disconnect the power brick. Wait exactly 60 seconds to allow the capacitors in the control board to fully discharge. Plug the power brick back into the wall first, then into the desk, and attempt the reset sequence again.
• Inspect for Obstructions: Check the lifting columns for any foreign objects or cable ties that may have slipped and become jammed in the telescoping segments. If the motor senses even a slight resistance (over-current protection), it will beep once and stop immediately.
• Verify Power Brick Voltage: If you have a multimeter, check the output of the power adapter. If the adapter is failing and delivering less than the required voltage, the keypad will have enough power to beep, but the motors will not have enough torque to lift the weight of the desk, triggering a fault.

Heads Up

• Avoid Manual Pushing: Never push the desk down or pull it up manually while it is plugged in; this desyncs the motor encoders and causes the exact lockout you are currently experiencing.
• Cable Management: Ensure your cables have enough "slack" at the lowest point. If a cable is too tight, it can act as a physical stop, causing the desk to think it has hit the floor and triggering the error beep.
• Weight Distribution: Avoid loading one side of the desk significantly more than the other. An extreme imbalance can trigger the anti-collision sensor, which manifests as a single beep and a sudden stop.
• Power Strip Warning: Always plug the SmartDesk Core directly into a wall outlet if possible. Low-quality power strips can cause voltage drops that interfere with the control box's memory.