Graphic card problem

Hello guys i really need your help about my new graphic card this one (leadtek px9500gt 512mb ddr3), my old graphic card is (pov geForce8500gt 512mb ddr2)...and ofc, my motherboard is asus m2n-x plus nFor520 ddr2-800 etc, and my monitor is samsung lcd 19''...

My problem is this...my new graphic card has 2xdvi inputs and my monitor has VGA,so i buy this thing(dvi to vga converter)



And when i connect everything and turn on computer i hear everything normally like fan,but there is no image on monitor only black triangles on black background(joke), my monitor is working perfectly with old graphic card but with new one   ,like he goes in sleep mode or something else..I dont know what to do,i already tried buying new converter but that isn't the problem.

Please guys if you know **** is this can you help me?Sry for bad english