I've got a sound issue with my PC

[WITHTEETH]

I built my new PC, Everything works perfect except this damn sound issue I'm having. My Asus Commando motherboard came with detachable onboard sound that resembles a PCIE slot, i had it set up and plugged in my front header "HD Audio" headphone/mic plug into the connector inside my case on the detachable card. I plugged in my headphones and i hear sound I'm suppose to, but also a faint hissing noise. theres no hissing noise when i plug my headphones in the back of my case though for the speakers.

 

The Hissing noise happens with i change a window, or drag a window, or even when i move my mouse. It changes its pitch to depending on i don't know what. but its always pretty faint. I plugged in my other Plug other Audio Plug that my case came with a "AC 97" and its the same deal, i hear sound, but also the faint hissing.

 

I took off the case front panel, and unplugged the wire to my front panel mic jack, and plugged it back in to see if it was a loose connection, nope, everything was fine, and it didn't fix my problem. Still hissing.

 

So i bit the bullet and bought a Creative Labs Xfi XtremeGamer PCI sound card to solve the problem. I Detached the other sound card, disabled it in the bios, deleted all of its drivers/software, and installed my brand new Xfi! I plugged in the HD Audio plug in the the Xfi for my front header headphones and VOILA! I still get the hissing noise, along with the regular sound im suppose to get...

 

I tried muting my LINE IN, MICROPHONE, and others, still hissing.

 

What in the world is the hissing from. :( >_< >_<

[Bokishi]

Try another PCI slot?

[WITHTEETH]

I just did that, nada. no luck thus far.

 

I really have tried everything i can think of. I even disabled the USB and IDE light that are located near the Headphone and mic jack. this is really weird.

[Bokishi]

It sounds like an issue with that hd audio front jack.