when i install ATI graphic driver my laptop screen power off(when i restart display normally continue until windows 7 boot logo load up....then display is black(no power)).but i heard windows is stratup.....some times blue screen problem happend .now i only using onboard vga (intel vga) and it's driver.my laptop 3d graphics doesnt work because of this problem......i install different version of ATI drivers...but it doest work. can i resolve this...plz help me..........