Hi Ticket Inquiry,
Thank you for reaching Microsoft Community.
End of life for Surface Pro 4, basically means that these devices are already discontinued by Microsoft and support for these devices has ended already. Even the paid out-of-warranty replacement option is not available anymore. With that, for hardware issues like what we have here where the Surface is not turning on anymore, we won't be able to provide a replacement anymore for the device.
Here are some articles and pages you can check for more details on this:
Surface driver and firmware lifecycle for Windows-based devices - Surface | Microsoft Learn
End-of-life management and recycling | Microsoft Legal
Here is info to help troubleshoot the issue:
Surface won’t turn on or start
Kind regards,
Marrion