Hp ENVY screen going white sometimes

I have an HP ENVY 17 laptop 1010nr model... Its a 17 INCH
I use it mainly for video editing and hard core pc gaming for games like battlefield 3 and mw3 and more...I have ran dsk chcks etc all sayign its fine...

Here is the issue, the laptop is going fully white, then flickering and sometimes with vertical lines but my external monitor works perfect, in fact there are rare moments where the laptop itself works perfect but the moment i start up a video game, about 2 minutes into it the screen goes completely white, i then have to hook it to the lcd external and its completely fine, no issues at all...