Hi, i have HP G62-B11ET laptop. When i bought it, its OS is Windows 7 X64. I changed its OS with Windows 8 X64. My computer has also intel hd graphics. When i changed graphics card with intel graphics and turned back ATI graphics, my laptop screen was black. Also when i was using ATI graphics, i changed computer sleep mode and turn backed normal mode, i have a same problem. My English isn't good. Thanks.