The PC is a Dell Studio 540, using Windows 10.
I have got a second Dell Monitor which I want to hook up. I found a second VGA port at the back of the PC (with a little cover on it). Removing the cover I connected a VGA cable (male at both ends) between this second port and my second monitor. I clicked Windows button+ P and the options for 'PC Only', 'Second Screen only', 'Duplicate Screens' appeared. However I can get nothing to appear on the second monitor. What is there is the message 'no VGA cable'. Can you explain? Are drivers missing?