Mountain Lion lockscreen when trying other startup options

Hi guys,
Facing this problem when I'm trying to boot from another startup disk (e.g. do a recovery install on the mountain lion system):
I do the command+r or the option holding while booting on my Macbook Air, and I simply get this lockscreen asking for a password and neither my masterpassowrd / onlyuser-admin-acconut-password work for it.
What on earth is this screen / what kind of password does it require then lol? My other computers have no screen when trying to do the same.
Picture to this:
https://dl.dropbox.com/u/2640980/lockscreenbootup.jpg

You can install systems like Lion and Mountain Lion without rebooting from a separate disk, just by running the installer. I would guess that this would not involve the firmware password (though I'm not sure, as that install method is relatively new and not mentioned in Apple's documentation of firmware passwords).
However, if you have done clean installs on that machine at any point, booting from an install disk or into recovery mode, then I would think the firmware password must have been added at some later date.

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Perhaps some guys have already asked many similar questions, but my case is slightly more awkward. So I decided to post a new thread and hopefully someone could help me out.
I started to experienced this wierd behavior of my macbook 13" last night. The symptom is like this:
When I powered on, I heard the start-up tone. But it sometimes remained black screen and sometimes showed me the apple logo without spinning gear.
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Mountain Lion lockscreen when trying other startup options

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