читаем тут:
http://pinouts.ru/Video/VGA15.shtml
видим:
4 11 12
ID2 ID0 ID1
n/c n/c n/c no monitor
n/c n/c GND Mono monitor which does not support 1024x768
n/c GND n/c Color monitor which does not support 1024x768
GND GND n/c Color monitor which supports 1024x768
следовательно 4 и 11 нога на землю