This is the first refurb I have ever received that was simply broken, but there's a first time for everything.  The HDMI port is non-functional.  I have tried:1) Changing monitors2) Changing HDMI cables, and interchanging them between different monitors3) Updating the integrated Intel HD driver4) Installing the stand-alone Intel Graphics Command Center5) Toggling Windows display settings (only one monitor ever appears in these settings, and that is the built-in laptop monitor)6) Reviewing BIOS settings - there were no relevant settings for disabling or enabling an HDMI portThere's a reason this is a refurb.  I have always had great success with open-box items, but every once in a while, you find out that a product was refunded for a good reason.  This one was.  It is broken, and it clearly wasn't put through its paces before it was sent back out to a different consumer.