I currenty use a SAPPHIRE HD 7870 GHz Edition OC and i believe that this card is one of the faulty ones that gives the infamous blackscreen problem. I contacted my retailer about it and they wanted the card, i sent them and they gave it back to me without doing anything, thay said that the card was fine. It's been a week till i got the card back and today the goddamn problem happened again. I checkec the other peoples videos about it and most of them have sound loops and buzzing but i don't but that's the only difference my monitor still loses signal and i haave to reboot my system manually i get no response to anything.(i only use a headset and i don't have my mobo buzzer attached) So i contacted them again and they wanted the card again and said this time proper acknowledgment were done. The thing is i want to be sure before sending the card back again. How can i make this problem pop up? Or know that my card is really faulty? It occurs so randomly...