Mother board that I have got GIGABYTE GA-945GCM-S2L (driver up to date) http://www.gigabyte.com/fileupload/product/2/2669/819.jpg I am using windows 7 Ultimate 64-bit, Sound card is built-in. I have got very strange problem when I try to switch between a headset and built-in speakers on my LCD monitor , sound does not work unless I have to restart PC. I tried to uninstall the drive for the sound card and install it gain but still that did not fix the problem. I have got this : http://i37.tinypic.com/2ebswgl.png What troubleshooting should I consider to find where the problem Thanks