I've now had the same thing happen twice in two weeks when booting my laptop. I get to the password log-in on a black background - and I get three identical versions of the password entry line, each in its own third of the screen, stacking up on top of each other. If I restart the computer, everything goes just fine, but I am worried about what might be causing this. Has anyone else experienced this?
Run Malwarebytes...you can find it on download.com ... just use the free version