I just bought a 6850 card and when I installed it my sound card crashed. It says its found in the deveice manager, but on the icon beside the clock I have a red cross over the speaker icon and it says "no speakers or headphones are plugged in". When I run dxdiag it says it does not found any installed sound card.
I tried my old grahpic card and then the sound works
I have a HP XW8600 the sound card is realtek and I have all the latest driver.