Having got my PC back from warranty repair I have a new motherboard. I now find that sound is not working as it should. System sounds play with considerable distortion but most other sounds like using my TV card or sound on some firefox pages like Dilbert animation and the BBC website are fine, some sound effects like background music on some webpages play with the distortion. None of this happens when I dual boot to Windows XP where all sounds I have tried are perfect.
I am running F16 and it is fully updated as of yesterday. The m/b is an ASUS M4A79XTD EVO with on board sound, I also have an ATI HD4350 video card with HDMI sound on it but this is not setup as the default sound card.
Can anyone suggest what is wrong with the Linux setup here please? As I said XP sound works fine so it's not a hardware problem.