Ive just bought a new displayport-vga adapter (which is working ive tested it). I have two monitors, one connected by this adapter, second by hdmi-dvi adapter (working too). There is a strange problem - when I connect main monitor, additional one turns off (and windows doesnt even see it), when I plug them both out, connect additional monitor firstly - then this one is working, and when I add main monitor - its not working, only additional works. What the hell is going on and what should I do? It seems like a software problem, all pc parts are working fine I guess.