Make sure you have it set for "Audio Multi-Output".See here - http://manuals.playstation.net/document/en/ps3/current/settings/audiomulti.htmlI had this problem when I first got my TurtleBeach headset and it took me forever to figure it out. Every once in a while a PS3 update would reset this setting to so perhaps that's what happened.
Anyone else ever have this happen? I go into the PS3 menu and try to test the device under Audio Devices and I'm getting nothing in the mic. I've double checked everything a dozen times. Everything is turned on. I can connect the USB mic to my Mac and it works fine. Any ideas? i hate to have to buy another mic for no reason. MX
Also, check your lounge settings to see if you have voice chat enabled. My mic did not work in your lounge either.