IMac mini displayport blank display on boot

I work in a school and we use iMacs as classroom machines for teachers. The iMacs are plugged in to vga projectors and are setup to clone in Windows. This worked fine on all our iMacs with mini dvi ports. We've just bought two lots of new iMacs with mini displayport connectors. The first lot came requiring a firmware update, the second lot were already up to date. The first lot seem to have issues where they forget that the projector is connected. The only way to get them to recognise the projector again is to unplug and replug the adaptor. This is a minor annoyance but tolerable - although the old dvi port iMacs just pick up the projector and adjust the resolution automatically. The second lot which came with the most recent firmware pre-installed seem to get stuck booting Windows when the displayport to vga adaptor is plugged in. It gets to the black screen (before the Windows logo appears) and then stops. Pressing enter seems to get it past this and continue the boot process - as if it needs some kind of user input. This is more of an annoyance because it makes doing updates remotely which require a reboot impossible and expecting staff to remember to boot their computers without the adaptor plugged in seems a bit ridiculous. I've tried updating to the latest NVIDIA drivers but the problem persists. Has anybody experienced this and does anybody have a solution?

So this is weird, playing around with the brightness controls seems to have fixed the problem - And yes I did try that yesterday but for some reason today that did the trick.

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