okay,so video card went out on computer,and someone who says he is an expert installed a radeon hd 4670 graphics card.now the computer has it in an unknown location so i cant update the driver and have absolutely no audio.want to know if anyone has any suggestions that may fix this.and plz,if u are not 100% sure dont answer.not trying to be mean,its just im still trying to fix what the last "expert" did.thnx so much.