Hi MelAllan,
Thanks for reaching out to Microsoft Community and posting your inquiry. We're sorry to hear that the device isn't booting up.
We suggest the steps below to troubleshoot:
• Press the Windows logo key + Ctrl + Shift + B. This restarts the graphics display driver. If the device was stuck on a black screen, this may resolve the issue.
• Force the device to restart. Press and hold the power button for 20 seconds. or try to press and hold the volume-up button and the power button at the same time for at least 15 seconds and then release both. The Surface may boot to UEFI.
Hope this helps.
Kind regards,
John Neil_J