No sound on new build pc

[sam698]

Hello,
can anyone help me, i recently change a motherboard ASUS-P8Z77-V-LX, everything is working fine only problem is no audio is coming out from front panel and rear panel.
thanks in advance.

 

[sam698]

and in the device manager there is no yellow "question mark" or "exclamation mark" it just does not produce any sound.