Hi,
Thanks for reaching out to the Microsoft community. I understand that you need to replace your Surface studio power cord. Please allow me to provide some option on how to do this,
I highly suggest that you visit the help article here "How to replace your Microsoft PC Accessory under warranty page here: https://support.microsoft.com/en-us/surface/how-to-replace-your-microsoft-pc-accessory-under-warranty-65402955-b97d-480c-93b4-de1defa89562
just follow the instructions or you may visit the Microsoft official store for more information and option for replacement here: https://www.microsoft.com/en-us/surface/buy?ocid=cmmjcz28if8
Look for the 3-prong female connector that fits into the back of the Surface Studio.
Wattage: Surface Studio 1 typically uses a 127W power supply, for guaranteed compatibility please visit this link, " Surface charging requirements and power supplies"
https://support.microsoft.com/en-us/surface/surface-charging-requirements-and-power-supplies-0d9d51d4-594b-464d-9086-c90f35b80c01
Hope this helps,
Regards,
Edward