I am fixing a friends dell computer, he uses the DVI connector in a dual monitor setup. On the back of his Dell, the VGA port had a plastic tab over it. The monitor I use to repair PC's is an old VGA emachine model. I took the plastic tab off the VGA connector on the back of his PC, connected my VGA to it and get a "THIS MONITOR IS WORKING PLEASE CHECK THE VIDEO CABLE AND COMPUTER". I have never seen this before, is there a way around this, do I need to buy an adaptor, I am doing this for free so I don't want to spend too much. I have googled and couldn't come up with anything.
Thanks,
Steve J