I have 2 display drivers on my laptop, the integrated intel one and the nvidia GT640M, I have the laptop set as to use the intel one for web browsing etc..and to use the nvidia for games. I have found that whatever driver I have installed for the nvidia GT640M it will blue screen in seconds after a program using it is started. I have tried uninstalling and reinstalling the latest drivers three times. I have went back to the previous drivers also and I get the same result. The game I am trying to play isn't even that demanding as it can run on the integrated graphics fine, which is what I am currently doing. So I don't believe it is overheating as if it was overheating wouldn't it overheat when playing on the integrated graphics also? So I'm just wondering if it would be worth it, if i send it in. My parents only bought the laptop a few months ago, the nvidia display driver has never worked, it would just switch its prefferred settings to the integrated intel one, which I didn't notice it had done till a week ago.