meffert

Hi, i'm a newbie, i have an egpu via wifi card slot, it named 750ti on device manager, and now i have 3 vga on my latop, hd4000, gt635M and 750ti. i still have only my latop and i don't have a lcd or something else, my friend play on laptop screen nomarly. The problem is here : if i disable the 635M, when i play a game it recognize the hd4000, if i disable the hd4000 too, the screen turned dark, it normal if i restart my laptop, so what it is problem ? you have any idea about it ? can an egpu play on laptop screen ? why it can't recognize my 750ti ?? tks you and sorry for my bad Eng