Holding option key can not switch to xp or mac os x

hello, i just installed xp sp2 in my mac book. everything is running perfect. only problem is that when i turn on my mac book and hold the option key, the icons of the mac and xp supposed to show up, but its not. only have a icon of a locker, need enter the password. after i enter the password nothing happened. i wanna know what's going on. have any solutions???

Hi
You appear to have a firmware password set and you seem to have forgotten it? Any one of these links might help you understand what's going on?
http://support.apple.com/kb/ht1352
http://forums.macrumors.com/showthread.php?t=881021
http://osxdaily.com/2009/10/19/bypass-mac-firmware-password/
http://www.macforensicslab.com/ProductsAndServices/index.php?mainpage=document_general_info&cPath=5_20&productsid=69
http://www.macpassword.com/category/firmware
Tony

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