HD audio device not function when upgrade to 4G RAM

I recently upgrade my RAM from 3G to 4G and my HD audio device didn't have sound come out. When i change back to 3G, and the Hd audio device running ok. Pls tell me what is the problem?
By the way, my processor is AMD Athlon 64x2 Duo core.
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More about audio device function upgrade
  1. Perhaps that extra stick of RAM doesn't match the other memory.
  2. Hi :)

    As said....check the speeds on ALL ram sticks to make sure they match...

    All the best Brett :)
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