With the audio circuitry on the board next to everthing else it is possible to get noise in the audio. Mine pops sometimes on a few games but over all is pretty good. If it does it all the time no matter what your doing then I would say you have a definite problem somewhere. Try turning the computer volume down a little and turn the speaker volume up to see if it makes any difference.
You are about to answer a thread that has been inactive for more than 6 months. If you still wish to proceed, please ensure that your posting is original and does not duplicate or overlap any prior responses to this thread.