Dell Latitude d600 no sound

[crdz]

I replaced the motherboard of my laptop d600 with a refurbished one
But this new MB after install the all drivers can't hear nothing, no sound
According dxdiag process there is sound installed, so I don't know what else do I need to check.
Plus, the buttons of the sound and mute don't respond but the power yes and are same circuit.
help please