I purchased this renewed small form factor Windows OS computer to augment my Chromebox.  My wife is beginning her master's degree, online, and it requires Windows and the online experience is sometimes incompatible with Chromebox (IDK why, just is).  So I wanted to set her up at a proper desk with a 27" monitor vice the 11.2" Windows 2-in-1 laptop she has.  Unfortunately the Lenovo desktop arrived and after hooking it all up, the boot up sequence processed until it errored out to "operating system not found".  I called the 1-800 tech support number listed on a piece of paper within the shipped box.  The polite and courteous technician said it is unfortunate but sometimes happens.  I was offered a replacement unit or a refund.  Not wanting to risk reliving the experience, I am returning it for a refund.  I'll now go to my local Best Buy and get something new and skip the chance to save a few bucks via the renewed option.  It has proven not worth the hassle.