External Monitor - detected but nothing showing

Hello
I have recently bought a miniDisplayPort-to-VGA adaptor so I could set up an external monitor.
Whilst in Display settings the second monitor is being detected, I just have a black screen/no signal.
My MB Pro obviously thinks its there, as the mouse travels off the side of the screen to the extended desktop, its just that nothing is showing...
I have tried a lot of things like restarts, altering resolutions, tried another monitor, tried other cables - and nothing seems to let me have an external monitor running.
Is there something I am missing here?
Thanks for any help

If two monitors have been tried and neither worked, that casts a lot of doubt on the adapter. Even though it is new, it could be defective. I recommend taking it back where it was purchased for an exchange.

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