My 2nd monitor won't turn on when plugged in

Hi guys,
I have a Macbook Pro (June 2012) and i am using the thunderbolt port to have an external monitor (Neovo F-417)
I am using an adapter between the monitor (which is VGA) and and the Macbook (thunderbolt port)
When the mac is on and i plug in the display, the screen goes blue for a second as it should but the monitor doesn't turn on but it thinks that the screen it there because it shows up in Displays in System Preferances and it allows me to drag the cursor off the Macbook screen and onto the blank screen
Any ideas?
Thanks
Chris

Then your adapter may be inadequate for converting to VGA.
There is a perfectly good Analog VGA signal already present. It is presneted on the DVI port on a Mac Pro display card. Asimple adapter will re-wire it for VGA use, no conversion required. Does no apply to your MacBook Pro.

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