Operating system

I have hp 640,it has windows 7 OS, it does not boot it only shows black screen with a words "ME unlock is forbidden in this production mode"  
any idea on how to solve this
concern_supportAsked:
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Tomas BjervedIT ConsultantCommented:
Are you able to enter the BIOS by pressing F10 button after you press the powerbutton? If so, see if you can resett BIOS.
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Radhakrishnan RSenior Technical LeadCommented:
Hi,

Manufacturing Programming Mode (MPM) used for all the fuctional tests. Usually all the manuafacturer's do this before sending the product for sale. If it's a new laptop then I would suggest to log a call with the vendor and seek advise from them.
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SnibborgOwnerCommented:
Having traced this through HP's forum the solution is as mentioned earlier, contact HP service, they will send out a disk that will unlock it.

Reference is here:

http://h30434.www3.hp.com/t5/Notebook-Hardware/manufacturing-programming-mode-is-set-to-unlocked/td-p/2197061
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