09-08-2013 07:42 AM
Unfortunately, business machines such as Probooks or Elitebooks have more stringent security than consumer models - they don't produce 'halt codes', the password cannot be derived from the Serial No. and the code is stored in non-volatile memory so removing the RTC cell will not reset the password in this case.
If you Contact HP Business support and are able to prove ownership, they should be able to send you a customised SMC.bin file which you can use at boot to reset the password - the only other method that will work on these machines is to replace the bios chip.
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Microsoft MVP - Windows Experience