This laptop just shut down yesterday during normal functioning within an year of purchasing. On starting up, the light would turn on and one could hear the fan, but the screen would just be black. I tried turning the laptop on several times and running it on the safe mode but it didn't work. I tried contacting Lenovo maintenance but they have no record of the laptop since there is no serial number on the backside and therefore they can't help. Having gotten it diagnosed from a service center nearby, they diagnosed the issue as a motherboard issue. They said there are no apparent signs of wear and tear and the laptop has been maintained well. It seems like the laptop may not have been a Lenovo original, considering that it didn't even have a serial number. They are saying external repair would cost upwards of 250$. I am an international student with limited means with a broken laptop within a few days from semester exams. Wont recommend purchasing this laptop from the seller!