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Looks like a hardware (or possibly display driver problem).
First step would be to try using Win+Ctrl+Shift+B to restart the graphics driver (although I'm not sure if this works on the login screen).
Second would be to plug into a monitor and see if that works. If it does but the laptop display is still knackered then have a look at the display drivers and displays in Device Manager. Run Windows Update to see if that does anything good as well.
Last would be to give it a whack and see if that fixes anything that had come loose (this may not be a good idea).
I presume this is the wrong place to ask this but, perhaps, someone can help.
Any ideas what has happened here and how it can be fixed?
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