Has worked great after 3 things were done on my end:1) case was filthy with grease and such. Simple to clean so it just was not done at the refurbishing place. Took the PC apart and cleaned everything inside and out.2) windows 10 was already logged in and had some icon pre-installed.3) windows 10 was not running right, couldn't open settings, control panel would randomly crash. So I fresh installed Windows 10, solved both issues 2 and 3.Computer has worked since without issue as a mini server 24/7 nvr.