Mini displayPort -- VGA Doesn't work (MacBook Pro 13" 2012)

Hi All,
I just bought a Macbook Pro 13" (cheapest one) and a Mini Displayport adapter to VGA, I want to use it with my Dell Screen but it doesnt work.
I only see a blue screen for a sec. and its gone... what to do?

Bring it to an Apple store or AASP.

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