I was playing Dying Light (with recommended settings) on my y510p with 2 gt755m's for about 30 min and my laptop just randomly shut off as if I took the battery out. Then my AC adapter started beeping and I unplugged it from the wall. My computer would not turn on at all. I then decided to take out the second gt755m from the ultrabay and the computer worked just fine. However the graphics card that I took out smelled very weird but I didn't think much of it. So I turned off the laptop, discharged it by holding the power button with the battery out, and put the gt755m back into the laptop. Once I plugged the AC adapter in the computer started to make a crackling noise and smoke started to come out of the vent of the graphics card. I immediately unplugged the adapter and took out the graphics card. The laptop still works fine and there doesn't seem to be any physical damage that I can see. However I think that the graphics card is fried, so I am sending the laptop back to Lenovo to either fix or send me a new one. I am posting this because I wan't to know if anyone knows what could have happened so that I can prevent it from happening again. I'm very careful with my laptop. I've never caused any physical damage to it (other than this situation), whenever I'm gaming i keep the graphics at the recommended settings and the laptop is always on an external cooler. Does anyone have any ideas?