Hello, i have problem with my notebook HP G72. When i was working sudenlly graphic driver twice restart and then shut down. When i restart the pc there was just a black screen but i can hear the sound of win start. I tried to reinstall drivers of graphic cards-both of them amd radeon hd 5*** serie and intel hd, but nothing works. Only results were 1) blue screen and error in atikmpag.sys 2) system stars but only intel hd graphic works, amd graphic didn´t exists in hardware manager 3) os starts but not even one graphic works. I tried varios combinations of updating bios, chipset and drivers but with no result.