Hey, Yest i bought a HD 4650 to replace my ATI x1550, on x1550 was sound working fine but when i replaced with a HD 4650 the sound was gone, i tryed to change the sound device on control panel, but nothing show up there i disabled the ATI HDMI, nothing was there for my motherboard intergrated card realtek HD audio.. it says the speakers are not pluged in, but everything is plugged in.. im running Windows 7 ultimate..
Control panel Sound :
Control panel Sound :