I wasn't sure if I should post here or in external, but the problem is with something internal that causes external problems.
My friend has a pair of Turtle Beach X12 headphones that are USB powered and gets a lot of noise in his headphones. Much louder and a lot more than you would expect from USB powered headphones. Music and sound does drown it out, but it is still quite noticeable. However, when he plays games it mostly goes away (which is strange). He recently built a new computer and this is when the problem started.
630W power supply, ASUS Radeon HD 7770, AMD-FX 6300 processor, ASUS Sabertooth 990 FX R 2.0, Creative Labs Sound Blaster Audigy Fx, Seagate Barracuda 500GB HDD and running on Windows 7.
*The sound card and HDD came from the old computer since they were quite new.
We checked the power management settings, checked multiple USB ports front/back, removed peripherals, used the on-board sound and sound card, turned system volume to max and controlled volume via the headset, tidied up his cable management (it was very sloppy), ensured the HDD was secure, ensured all screws and connections going to his motherboard were tight, replaced SATA cables, had him plug the USB into an AC power adapter and, upon doing the final step, the noise was gone. Upon seeing the problem was gone by using a separate power supply; I can assume all the feedback is coming from something in the computer. What do you think would be causing all the noise in his headphones? I am truly at a loss at this point.