Hi everyone, Because my gtx 670m gpu died i had to search for a new one to replace it. Luckyly a friend of mine could give me one funcional from another medion erazer, a gtx 560M. I instaled it and it have been automatically recognizes by windows 7 and i could instal the drivers without any issue. My problem is that one : The system is unable to activate the gpu, and even by modifiying the nvidia optimus globals or by program options... I saw that someone already had this problem by downgrading his gpu at this thread : https://forum-en.msi.com/index.php?topic=253417.0 But he could manage to resolve his problem because they are nearly the same gpus : NVIDIA GeForce GTX 670M | techPowerUp GPU Database ; NVIDIA GeForce GTX 570M | techPowerUp GPU Database. In another hand, mine is a different one : NVIDIA GeForce GTX 560M | techPowerUp GPU Database I also read in that thread that for upgrading a graphic card, the most important part is the power output, wich is the same for the 560m and the 670m : http://forum.techinferno.com/general-notebook-discussions/8192-%5Bguide%5D-how-upgrade-medion-erazer-gpu.html So i dont know right now if i should modify my bios, my vbios, only reinstall windows... and how, because i didnt see any thread about DOWNgrading issues.. Thank you for your help ! My specs : OS : windows 7 6.1.7601 SP1 build 7601 Bios : E1762IM7.105 Motherboard : MS-1762 barbone PS : Sorry for any language errors, english isn't my native language.