Need help, front panel audio input not working properly?

[cauzomb]

Try checking in the mixer tab of the realtek audio control pannel/ see pic below. In your case, it would be unmuting/raising volume and possibly "boosting" the "FRONT" input rather than the REAR input shown in the image below.

In the Realtek control panel choose the Mixer tab...you will see Playback and at the bottom Recording...you would think the settings would be in recording...but they're not...they're in playback...
Scroll down the side of playback using the buttons until you get to FRONT PINK IN & REAR PINK IN...
By default both are muted and lowered

Image from post by Eddieman_94 at Rage3d.com