My password was changed now it says system lockef how do I get back in ky computer.

My password was changed I don't know how to get back in my computer. It only show these on the screen F1 F2 F7 F9 and F10. How do I reboot my computer so I can get into it znd start over

Enterprise or business class notebooks such as the ProBook series have very stringent security.  
Since you stated "system locked" that is likely to mean someone put in a power on password.
 Access to your notebook will require replacement of the BIOS CMOS chip.
HP or a BIOS company will be the best choices for that, but if you have a high level of electroonics disassembly and soldering skill you can do it yourself. You will need an identical CMOS chip that has been programmed with a fresh copy of the BIOS ROM file that is applicable to your notebook.
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2015 Microsoft MVP - Windows Experience Consumer

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