OK, I have a couple of questions just to clarify things.
What are you using to listen to the sound and where is it plugged in? headset, front panel also tried back panel
Is the BIOS setting for HD Audio/AC97 set to match the case plug that's connected to that header? i don't know what's the right settings but I tried switching settings, but fails to hear any sound.
In Control Panel > Sound, what is set as the default playback device? If you are using speakers or a headset you do not want it set to HDMI. its realtek hd audio.
I purchased a USB sound card (adapter) which converts my phone jack to USB, windows installed a generic USB sound card adapter still the same issue the sound meter is going up and down but I still hear no sound.
Tested the headset with my iPhone, its not busted cause I hear music.