Here's the poroblem for you dear company HP.
I have Nvidia Geforce 840m driver.One day i pull down tea on my pc and i repaired.Then i reliazed i have just intek graphic driver,there is no nvidia.i tryed to install nvidia driver which i download on hp website and it doesnt work. however in turkey 1 dolar = 4 tl . if i can buy a new pc I d rather not buy a new hp thx for no helping