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I umplugged and moved my iMac (2.16 GHz Intel iMac running 10.5.6) to another room. When I turned it on, I was locked out of both user accounts.

I am 100% certain that I entered the passwords correctly on both accounts, as I tried each multiple times.

After I restarted the computer from the login screen, my passwords worked.

What in the world could have happened to cause this? Is it likely to happen again? Should I have a Linux Live CD waiting just in case?

Thanks!

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Is there any possibility the keyboard layout may have been switched? IE, from QWERTY to Dvorak or vice versa?

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I agree that this could have been the issue. This has magically happened to me a few times at the most inopportune password-entry moments. Luckily, it was while I was logged in so that I could see the little Canadian flag turn into a DV when focused on that password field. Weird that it happens at all. –  fideli Dec 29 '09 at 16:22
    
That must be it. I use multiple keyboards. Thanks! –  user22914 Jan 4 '10 at 5:19
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