IMac27' for PC Screen ( MiniDisplay Port - VGA ) issue

Hi everyone,
I want to use mi 2009Late iMac27' as external display. I use a MiniDisplay Port to VGA adapter for conecting the iMac and the PC via VGAs
The problems appears when i connect them and nothing happends, only a "Blue Screen" ( like when you change the resolution ) and nothing more. CMD + F2 does nothing and i dont know what can i do for fix this...
Anyone can help me?
Thanks and sorry about my poor english =(

Hi BDAqua,
the PC graphic card has not MiniDisplay Port...
So if i want to use mi iMac27' as screen the pc has to have at least a MiniDisplay Port, no? That's the only way?
Can the graphic card use a adaptor for this task ( Like VGA - MiniDisplay Port adapter )? My graphic card has DVI and HDMI ports for more info.
Thanks for the help, you heal me a big headache

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IMac27' for PC Screen ( MiniDisplay Port - VGA ) issue

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