I purchased this (refurbished) small tower computer to work as a dedicated Windows 10 computer to drive a CNC Mill. I did the start up exactly like the two sheets of paper that comes in the box, however, what I saw on the screen was different than what was in the instruction. It never asked for the Windows 10 activation key that the instruction sheet described.So I followed the instruction on the screen and got Windows 10 up and running. I tried to map a network drive on my home network and could not get it to show up in windows explorer.So I shut the computer down for the day and the next day when I started it back up to continue to attempt a drive mapping, the computer would not boot up.I sent the computer back and purchased a NEW one and it works fine.I would never buy a REFURBISHED product again!