Screen frozen with big lock on the center of the screen, Plz help!

After reboot, screen goes grey n big lock on the center of the screen, there is also a box below for some sort of password, but it doesnt work with the usual one. Plz help!

If an Open Firmware password has been set, then you can not do anything until either the correct password has been entered, or the requirement for it has been removed. Reason - an Open Firmware password is a hardware-based setting. With that active, you can not boot the machine to anything until the correct password has been entered - even replacing the hard drive will have no effect.
Hence contacting Apple's Tech Support - they can talk you through a means of removing it.
Edit - -
I googled a bit and found this -
How to Disable a Firmware Password in OS X 10.6 | eHow.com
It may offer a solution.

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marloyee wrote:
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What happened when you tried to restore and update the iPod?

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What happened when you tried to restore and update the iPod?

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http://support.apple.com/kb/HT5625
-Griff W.

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Screen frozen with big lock on the center of the screen, Plz help!

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