My 2012 MBA (no bootcamp) just shows a bare splash screen without user avatar nor password field after booting. Now I've seen this problem twice, I can type my password and then hit return on keyboard to login, but the login field never shows.
What's the problem here? Any fixes?
Best Answer
The problem is that OS X detects 2 monitors and thinks that the secondary monitor is the main one.
This can happen with a monitor connected to the Thunderbolt port or in your case, as you state in a comment above, using virtual monitor software Air Display.
Apparently, Air Display didn't detect that the built-in MacBook Air monitor was active, so it sent the video signal over WiFi to a peer Air Display device.
As a consequence you only saw the bare splash screen.