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Windows Device Manager

Code 51: This device is currently waiting on another device or set of devices to start

The failing device depends on another device that has not started.

First action

Inspect other failed devices in the Device Manager tree and resolve the dependency first.

Use the error code as a Windows device-state clue. It does not by itself identify the exact failed component inside the hardware.

Then verify

Do not stop at the code disappearing

  1. 1

    Work outward from the earliest/parent failure.

  2. 2

    Retest Code 51 after the dependent device starts.

After Windows reports the device normally, run the matching DeviceOK test when one exists—for example camera, microphone, keyboard, mouse, controller or audio—to confirm the user-facing function works.