Hello, 3 days ago I turned on my PC and just after the Lenovo logo appeared the screen turned off, so I watched videos on the internet to find out more and I did the manipulation following: crtl+shift+win+ b, this manipulation worked. However the next day same problem, and the manipulation from the day before no longer worked. So I went to ldlc, a repairman put my PC in safe mode and cleaned all the drivers for my graphics card then reinstalled some but the black screen appeared again. He concluded that the graphics card was dead. But now I turned on the PC using safe mode, deleted the drivers then when listening again I wanted to test its new capabilities and I launched games and everything went well, in the task manager the graphics card worked normally at first glance. I would like to reinstall drivers but I'm afraid it will crash again. Do you have any idea of the cause of this problem and possible solutions?