My first monitor is pluged in my motherboard's VGA slot . Now i bought a new GPU with DVI slots . Because didn't have a DVI cable(i couldn't find one either) i bought a DVI to VGA adaptor and pluged in my second monitor . I went to control panel-->Display-->Screen Resolution and my computer has detected the second monitor (in the multiple displays i have put both extend and duplicate these displays) but the screen doesn't display anything . What do I do now ?