My 2012 MacBook Pro with Sierra recently started hanging at boot. It seems to start normally; the Apple logo and progress bar appear, but it hangs at about 3/4 of the way through.
Right before I first had the issue I was using the machine normally then very suddenly (I'm not sure what triggered it) there were display issues where vertical lines appeared on the screen and the computer became unresponsive. I restarted it and it never came back up.
The same problem occurred when I tried to boot into the recovery partition and Windows 7. I thought this was a hardware problem so I started the Apple Hardware Test with option-D and ran a diagnostic. It came up empty, no issues.
I remembered that I had an old Time Machine backup sitting around. I tried to boot from that but after a few seconds the screen went blue with small black vertical stripes.
Does anyone know what the issue could be and how or if I can fix it?