I have a Yamaha 724 3D card. It was preinstalled. A few months ago while on the internet PC freezes and I had to reboot. No sound. No speaker icon, nothing in device manager, nothing listed in Sounds/Multimedia. After trying to reload driver from cd and downloading a bunch of Yamaha files all I can get to load is something called a Codec file. Even when I remove it Windows detects hardware (always something called Codec but never Sound Card), can't find driver, I insert cd but it can't find some Audio dll file. Eventually I find that Codec thing listed in device manager but never the sound card. It works for a few days, weeks then the sound goes out again. I know the Sound Card was listed when I first got PC. I probably messed up something the first time I tried to fix it. Is there something I can do to correct this or should I just buy another sound card and if I do will the new card be detected instead of that Codec thing?