I bought this PC as a backup to replace an older Dell Optiplex.  Since this Amazon Renewed product "is inspected, tested, and refurbished, as necessary to be fully functional"  I expected all components to be mounted and clean.  When I opened the cover, I was surprised to see the case fan unmounted laying in a drive bay and the inside the case hadn't been cleaned.  I guess I shouldn't have been surprised the unit was dirty since the check sheet didn't show the unit was cleaned (see pics).The unit did initially work so I contacted RUKN-TECH to see if they could provide mounting hardware for the fan.  This was there response:"Hello, we're sorry for the inconvenience, we do understand how you feel and would love to do something about it. As we do not currently have this model of hardware in stock at our warehouse we are unable to ship it to you, but we will do our best to assist you!"The unit has been returned.