Verify the VGA cable you are using is a true one to one cable. If the cable tied multiple pins together internally, that might be the source of the problem.
pin 1 red video
pin 2 green video
pin 3 blue video
pin 4 monitor ID bit 2
Pin 5 system ground
pin 6 red video ground
pin 7 green video ground
pin 8 blue video ground
pin 9 N/C or missing (Key)
pin 10 Horiz & Vert sync ground
pin 11 if tied to ground, the display is color or Monitor ID bit 0
pin 12 if tied to ground the monitor is monochrome or Monitor ID bit 1
pin 13 Horiz sync or Composite video sync
pin 14 Vert sync
pin 15 Monitor ID bit 3
Can you open the cable shield on the VGA cable? That is probably what is connected between the two chassis.
Edit: Additional questions.
1) Is the computer also tied to shielded network cables?
2) Do the hum bars go away when the audio is disconnected.
3) Does the audio buzz go away when the video cable is disconnected?
Last edited by LarryC; 01/15/12 05:47 PM.
