No Sound! Cmedia/XP

[I Gotta Push]

For no reason earlier, my sound went out. I have a USB headset and headphones which plug directly into the sound card's colored input plugs. The mic on my headset works but I can't hear anything. I've tried rolling back/updating my drivers, system restore, and nothing..! I run XP and am using CMI 9739a. I've rebooted several times as well. Any help would be appreciated!