Unit arrived several days earlier than forecast, BUT… was DOA.  Hooked up keyboard, mouse and monitor (cannot use a HDMI cable as this has 2 Display ports and a VGA but no HDMI) turned on to a Blue screen of death that stated “cannot access hard drive”, tried a couple of different boot options F10 and all that with negative results, would not recognize the SSD, so RMA the little beast as it is not big or heavy enough to use as a boat anchor.  I stuck a recovery flash drive from my HP laptop and booted from that and wow it worked and installed Win 10 Home, but it was, an unauthorized copy and Windows would not activate.  Downloaded Win 10 Pro, installed with out any problems, it activated with the supplied Windows Key on the ‘puter box.  Now of course there were none of the correct HP drivers installed, only the generic drivers that are on Win 10.  Then had to download all the drivers.  From the onset I now have 10 to 12+ hours invested in this little beast (hint: use the “HP Support Assistant” as it will allow you do D/L the correct drivers for whatever modules and chip sets are inside the box, and they can vary from box to box).A couple of other things to point out.  I noticed the two RAM chips were mismatched (different manufacture and speeds, although there were 8 gigs, but it would clock at slowest RAM chip speed.  While changing out the RAM I found the SSD was not installed properly, only 2 of 4 mounting screws were used, allowing the SSD to move around, which is more than likely the root cause of the original problem. I can say one positive thing, there were several reviews that said they had to clean out the dust bunnies.  The inside was very clean.