Although the MacBook reached in a working condition, I noticed it started to have intermittent restarts on it's own.  I kept using it but suddenly is failed to power up, took it to Apple Store to investigate, and they discovered unrepairable motherboard damages due to corrosion cause by liquids!!  I wouldn't write this review if i was my fault, and I cant blame the seller as it's past 90 day, but my advise is never buy a "certified-used" MacBook anywhere online!