Same issue for 2 brand new surfaces we have, From my testing and investigation it is an issue with windows 10 version 1803 and the intel HD graphics 620 Drivers.
Issue starts occurring when windows is rebooting and installing the latest windows update, the update takes some time and the surface potentially goes to sleep during the upgrade and some corruption happens with the OS or display drivers.
Surface boots to where the usual login screen would be and you can only see a flashing cursor.
Luckily for me I have a remote kaseya agent installed so can remotely log into the machines and can see the device working fine besides the obvious fact that the screen is on but black. If you open device manager and disable the HD graphics adapter the screen
magically comes on the physical device and everything works fine.........besides the surface Pen will not write because it needs the graphics driver.
Have used the latest version of the HD graphics driver to help resolve the issue (complete uninstall and reinstall fresh) but this does not have any effect and the device continues to display a black screen with the graphics enabled.
Can anyone from Microsoft please provide a patch for this or a new driver version that actually works?
Devices are Surface Pro (5) i5 8GBram 128GB SSD