Welcome to the HP Support forum. Thank you for posting.
You have made a great choice with your HP 4320.
With regards to your issue - This is Probook and is a business class computer. Most business class notebooks (including yours Elitebook and Probook) have better security. They do not produce halt codes so entering wrong code 3 or more times won't help.
You will have to contact HP Business Support for assistance on removing the password.
HP Business support should be able to send you a customised SMC.bin file and instructions which you can use to reset the password. The assistance from HP for such issues is usually free for business class computers.
Hope this helps. Let me know if you face any issues.
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