Windows and Mac projection issue

Hi, this problem is not specific to OpenLP but arose when using it and I am hoping someone on here will know the answer.   I was happily projecting OpenLP on my usual Windows laptop when i had to disconnect it to allow a guest speaker to present using a Mac.   When I reconnected the Windows laptop, it would not detect the projector.  Restarting the laptop didn't help and I eventually dioscovered I had to restart the projector which of course takes time as it has to cool before you can turn it back on.   Any ideas how to overcome this ?   It seems that once the projector has been connected to a Mac it won't recognise anything else.
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