macbook mini display port to dvi adaptor

[nicho12]

i have a macbook (new alumminum one) and I went into town to get an adaptor to use with my monitor, I bought the one to dvi because I have a VGA monitor, and currently use a dongle with my pc graphics card, so I thought I would be able to use that.

the macbook detects the monitor fine and the resolution but nothing displays on the monitor screen, it says no signal input.
Anybody any ideas?

 

[nicho12]

im using macbook > dvi adapter > dvi to vga dongle > vga cable to monitor

nothings showing on the screen but the macbook detects it..
I got the dvi as I thought If I were to upgrade It would be better to future proof it that way...

 

[nicho12]

Ah yeah I have taken a close look and there is 4 extra pins on my gfx card output than on the macbook one
cheers