Beats audio and Bose QC15 Headphones buzzing, HP Pavilion Elite HPE Phoenix h9-1130

[CR96]

HP Pavilion Elite HPE Phoenix h9-1130

Windows 7 Home Premium 64-bit

Bought the system two days ago: only installations are Steam and its respective games, my printer, my router (Cisco Linksys E4200), MS Office 2010, and my webcam software

Whenever I plug my Bose QuietComfort 15 headphones into the computer, there is a constant buzzing noise in the background that never occurred with my old HPE-112y.  Most of the time it is faint and becomes unnoticeable if I play a song, etc., but when I launch a GPU-intensive program (i.e. Portal 2) the buzz becomes very noticeable and annoying.  It almost sounds like a very high pitched squeal.  Any help on this issue would be appreciated - my headphones are noise cancelling and sound perfectly fine on any other device except this computer.
 

[Tea1990]

I'm having the same exact problem! Regardless of what headphones I use, I'm getting a strange, constant high-pitched mechanical sound in my headphones. I just got this computer the other day, and the noise has been occuring from the getgo. It seems to get louder and more annoying the more the computer is processing.

HP Pavillion HPE h9 Series

Windows 7 Home Premium 64-bit

Model No. h9-1100z