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Verifying that the AC adapter LED light is lit is a crucial first step when troubleshooting a notebook computer that shuts down due to a low battery warning despite being plugged in. This LED indicator provides immediate visual feedback about the status of the AC adapter. If the light is on, it indicates that the adapter is supplying power to the laptop, suggesting that the issue may lie elsewhere, such as with the battery or power settings.

If the LED is off, it points to potential problems with the AC adapter itself, including a possible failure, a faulty connection, or issues with the power outlet. This step is efficient as it helps quickly identify whether the power supply is functioning properly or if further investigation is needed regarding the power source.

The other steps, while important, would not address the immediate concern of power delivery as effectively. Checking the battery's seating is essential but usually comes after confirming that the power source is functioning. Similarly, power settings can influence battery performance but are less likely to be the direct cause of a shutdown when the laptop is plugged in. Replacing the power outlet would be a last resort after confirming adapter functionality.