Hi Ron Chasse,
I understand how concerning this is, especially when the RPC message prevents you from accessing Settings or even using the normal power options.
For a Surface Pro 6, press and hold the Power button for about 20 seconds. Keep holding it even if the screen turns off and release it only after the Windows logo appears again. Before restarting, disconnect any USB devices, docking station, external display, or other accessories.
If Windows starts afterward, please back up any important files first. Also, avoid disabling or changing the Remote Procedure Call (RPC) service, as it is a core Windows service and changing it may prevent Windows from starting correctly.
If the same message returns and the device remains unusable, the recovery options described above are the appropriate next step. I would try Startup Repair first and leave resetting or using a recovery USB as a last resort because those options may remove personal files and installed applications.
Does the RPC message appear before the sign-in screen or after you sign in to Windows? That detail will help determine whether this is primarily a startup problem or an issue within the Windows user session. Thank you so much for your understanding.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.