Hi, I have a HP dv9819wm laptop with the Altec Lansing speakers running Vista Home Premium 64-bit with NVidia graphics. I have the red X on the speaker symbol. It tells me that there is no audio output device is installed. A friend recently gave me this laptop and it was full of viruses and I did a complete factory restore. The problem is that the sound card doesn't even show up in the device manager with the usual yellow triangle and I've tried re-installing the driver from hp but it pops up that there is no sound card found. I racked my brain on it all day yesterday and now need help. Thanks in advance for all responses!