HT1338 Multidisplay using MiniDisplay-To-VGA adapter and HDMI

Hi,
I have connected a Minidisplay to VGA adapter to the Minidisplay/Thunderbolt port and started the MAC along with the HDMI connection already i was using. Now the HDMI display is showing only a white screen and the VGA monitor is blank. Please help me to setup the multi display setup using the onboard HDMI and VGA adpter connected to the MiniDisplay/Thunderbolt.
Thanks,
Abhayadev S

I am using this adapter http://store.apple.com/us/product/MB572Z/B/mini-displayport-to-vga-adapter

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