Try to get into recovery mode. Windows 10 will go into recovery mode
automatically if it fails to boot. If it doesn't you will have to
boot off a Windows 10 install CD or USB flash drive. You can download
either one of these at Microsoft
https://www.microsoft.com/en-us/software-download/windows10

If that doesn't fix it I would restore your backup image ... you do
have one right?

If none of the above works you might  want to check your hardware.
Boot off something else like a Linux USB stick, and take a look at
the hard drive to make sure it is working OK. Run memcheck to make
sure RAM is good. And I bet your Surface came with it's own hardware
diagnostic software.. probably in the BIOS.

Good luck.

m

>the word "Surface" appears on the screen -- this is normal.  But it
>used to be that that was followed by the Win10 start-up photo, which
>I would drag aside to reveal the logon screen.  But now it never
>gets to the photo, it just sits displaying "Surface".  What can I
>try? David Gillett

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