No sound realtek ac97

Hello everybody,

I have a problem with my sound on my motherboard Asus A8N-SLI Premium (XP sp3 - AMD athlon 64x2 Dual 4200+) , I have updated my graphic card Ati rodeon x1600 for a Nvidia GTX 260, with a new power engine m600 from Recom.
Now I don't have sound :( My driver realtek ac97 is working porperly with last driver...., the connectivity with speaker is good, I formated, I have also tested with a new external sound card ; and same problem...
anyone can help me?
thanks
Have a nice day.
Sorry for my English;)
Veens