Why is Windows 7 Black Screen after Login, my gpu is broken?

[artiny]

Hy

I have HP G72 with i3 cpu (inside intel gpu) . Afrer reinstall the laptop the intel driver was instaled firstly and when I want to instal the amd 5470 driver from hp website ,after the restart the laptop after Windows 7 logo the screen is black.
Why is beacuse the gpu is damaged?

 

[Narzter]

when restarting, did you see anything except black screen?

I think you might have some GPU driver error. Reinstall all of them is you can.