updates: the computer starts to restart itself after I am playing a youtube video. After a couple of times resarting, the computer starts to scan and repair C drive.This is the first time I bought a used computer but is very happy about it. The hard disk drive is brand new (SSD). It also comes with new keyboard and mouse. So far the computer is super fast as it has the i-7 processor inside.I bought a brand new desktop a few years with much more money. but it is not as fast and quite as this one.This is definitely a great investment!