I am a Software Engineer and work with refurbished computers all the time. Occassionally, I come across a bad apple, and this was one of those apples. The inside of the computer was dirty and the CPU fan did not work. Wasn't worth replacing the fan so I returned the computer. I'm surprised that the technician who tested this computer did not check this.Moral of the story:, when buying refurbished computers, ALWAYS:- buy a new hard drive for the computer, as the ones that come with the computer are almost always old or low quality. Samsung SVO solid state drives are great for everyday use- run the built-in diagnostics- open the case and make sure it is (mostly) clean and that all fans are working.Hopefully the next buyer has better luck than me!