I can't seem to turn off my 2nd display (with no adapter plugged in)

Been looking on the internets for ages about this and not got anywhere, so did a completely fresh install last night.
The problem is that the DVI (2nd display connection) thinks that I have a VGA display connected (i.e. the 2nd display) when I plug in the DVI-VGA adapter to use with a TV that works fine. The 2nd display resets to align itself to the TV connected.
When I disconnect the adapter the Mac resets it display. Back to having this phantom display connected.
I've plugged in the DVI-VGA adapter as well and then carefully removed that and sameroblem.
Having done a fresh install that would mean it's not a software issue, so it has to be a hardware one? Something with the actual connection? Does anyone know of any potential problems as to why this would happen?
I've tried some compressed air. (I've lost the straw so it was straight from the can, spray paint style)
Please help.
Thanks.

Anyone?

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I can't seem to turn off my 2nd display (with no adapter plugged in)

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