How can I retrieve a cmos password from a DV4000 HP Pavilion?

I've got a customer with this model laptop and her son apparently activated something as a cmos password. No one knows what it is.
Any chance of fixing this?
Thanks,
TIm

http://forums13.itrc.hp.com/service/forums/questio​nanswer.do?admit=109447627+1258113230584+28353475&​...
http://forums11.itrc.hp.com/service/forums/questio​nanswer.do?admit=109447626+1258113435468+28353475&​...

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