Help with xbox 360 vga adaptor mod

[BCB]

I need help with the benheck design xbox 360 vga adaptor mod found on ngaget.com. The problem is with the audio. i cannot get a buzzing sound to stop when i connect the left and right audio ports while using the vga mode. when i connect the composite video to the port and to a television the buzzing stops, but if i disconnect the video and leave the audio ports plugged the buzzing resumes even when switched to composite mode. i think i have grounded everything i can ground, checked all connections and all are fine, no crossed connections, i believe my shielding is well.... shielding. its a spot where i am stuck and cannot seem to fix the problem so thank you for reading this post and please take the time to reply if you think you have the answer. thank you very much and God bless.