Hi ,,After installing service pack c i lost all the sounds , gear lever , flap lever , tcas sound , sound of various switches etc , when i open explorer they are in the sound/pmdg folder .I did a reinstall of the 737 , with the base package there are no problems , with service pack b , no problems but when i install service pack c the sounds are all gone .I re downloaded servicepack c 3 times but no succes . it seems like the engine sound is also the deault fsx sound ...I searched the forum and saw a topic about the fmc sound menu so i looked at this fmc page but there is no device listed in the sound page of the fmc , in service update 2 there was .I don't use a soundcard , i use the on board sound chip , the sound of all the other planes are working fine ,Can somebody help me with this ,Best regards ,Gérard

Have you tried hitting Q? (Once and twice?)

Download and install this: http://www.microsoft.com/download/en/details.aspx?id=8109