While the dvi is disconnected the vga acts as it usually does, by stating that it is in power saving mode. Upon re plugging my dvi back into the computer, my icons had been shifted around the screen as if they were configured for the size of the vga. This gives me the impression that the computer is recognizing the vga when it is plugged in but the monitor itself is not registering. When the vga is unplugged it turns fully on but goes right back into powersaver mode upon being plugged back in.
Im having the same issue pretty much but I'm using an HDMI male to VGA female port. The monitor just goes to sleep after a few seconds of working properly.
do you also have onboard video that has vga port in it? can you try both vga cords & monitor on a computer that has a working vga port to confirm the cords & monitor do work?