Microsoft AC power cord recall for eligible Surface Pro 3 or earlier devices:
https://support.microsoft.com/en-gb/surface/microsoft-ac-power-cord-recall-for-eligible-surface-pro-3-or-earlier-devices-4d46b233-acd2-9714-9ece-0ff48327fbc5
We're recalling and replacing the Microsoft AC power cord for the original Surface Pro, Surface Pro 2, and certain Surface Pro 3 devices. We have details for you about what devices are included in the recall and, if your Surface Pro power cord is eligible, how to order a free replacement.
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