My dad brought home an old computer a few days ago, and it didnt have a 15 ping vga plug for my newer monitor. It came with a 25 pin to 9 pin adapter, so i assumed the 25 pin port is for the monitor, and all i needed was a 9 to 15 pin adapter and it would work. Well i got that, and when pluged into the plug maked "11" , the monitor acts like its not pluged into anything. Is that plug even for the monitor? Can i get a new monitor to work with it? Or do i need an old monitor?