Hi
You may try to update BIOS on the unit, Below is the link for you to download, Choose the Operating system and download the required file.
http://h20564.www2.hp.com/hpsc/swd/public/readIndex?sp4ts.oid=8323799&swLangOid=8&swEnvOid=4059
If the issue persists, I would suggest you to contact Hp technical support and raise a request.
HP Worldwide Contact:
http://www8.hp.com/us/en/contact-hp/ww-contact-us.html
I hope that answers your question. 
I am an HP employee, the opinions expressed here are my personal opinions, not of HP.
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