Although my speakers work(the power light is on) they dont produce any sound (except when I adjust some settings with Sound effect manager, I can hear a sound). So I guess this isnt a hardware problem.
I think the problem is some Ati HD driver which I installed together with the cards drivers..Could it be? Its the first time I experience this.

P.S.(My new card is working perfectly except of the fact that I cant turn AA on. I am sure this card has AA option but where to look for it? CCC isnt working )