I've just setup my computer since January '10 and have noticed that my Zero DAC/DT770 configuration is playing sound very, very dimly. To even get a faint sound, I need to turn the dial completely to the right, whereas before, I only had to turn it a quarter turn or less to get loud sound. I've had a look at the audio settings and found nothing unusual. I also installed the newest version of the Realtek HD audio driver. Are my headphones busted? I still have until Oct. '10 before my two-year warranty expires.