I just bought a new lcd monitor. It has a DVI slot. It is DVI-a and DVI-d capable. My video card is pny ti4400 which has a DVI slot (i think - it has a blue for vga and white for dvi right?). When i try to change to dvi-a or dvi-d mode on the monitor, it says "no dvi signal". What am i doing wrong. Thanks in advance to posters.