The missing pin is probably not the problem. Unless you can see a broken stub in the housing the pin was probably deliberately omitted. For typical VGA connector pin allocation see this site click here. I think your original posting referred to a "No signal" message. Some monitors display this message when they don't receive a signal, others will just have a blank screen. No signal can be caused by a faulty cable, but usually a faulty cable will just be lacking a single colour. No signal can also be caused by a faulty graphics card, or the graphics card not being seated properly in it's motherboard socket. It can of course be caused by the motherboard or some other part of the computer being faulty, but if the computer boots normally and gives the usual Windows boot sound, then I think the graphics card is the most likely problem.