Hi Dave
Press and hold the power button for 5 - 10 seconds to perform a hard shut down
Then restart your PC and see if it starts normally
Most likely this is caused by a corrupt video card device driver, however, to diagnose the underlying issue, I need to analyse your Mini-dump file(s):
Open Windows File Explorer
Navigate to C:\Windows\Minidump
Zip up the contents of that folder
If you have problems zipping those files, copy them out onto your Desktop and zip them from there
Upload the zip file to the Cloud (OneDrive, DropBox . . . etc.)
Then post a link here to the zip file, so we can take a look for you . . .