No sound in Crossfire but in everything else?

So.. I don't have sound in Crossfire but my sound works for EVERYTHING else...
If you need my specs post it below or send me a message. I don't like playing with no sound D=

+ I hope a GM or CM reads this because I have been trying to contact them through tickets (still no reply) and Saidin blocked private messages I think? And it wont let me send messages to any other GM / CM so oh well..

Please help, I like playing as GR in Ghost mode and I always use headphones to hear breathing which is why I get kicked a lot and do good a lot