I have a M-Audio Revolution 5.1 sound card in my 939 build (EPoX 9NPA+Ultra mobo). I disabled the onboard sound in the BIOS and replaced it with said sound card at the outstart; it has the latest and last driver M-Audio offers. This was sounding fine in the beginning with no background noise at all. However, in the last 2 months I am now getting pops, crackles, and scratching sounds whenever I turn my speaker system on. All connections and jacks are solid and the sound card sets fine. I am wondering if this might have been due to when I flashed both by BIOS and nForce 4 chipsets to the newest offerings. Any ideas or advice would be much appreciated. Thanks.