Second monitor randomly becomes primary monitor

I've got a 2011 Mac Mini that is being used in a church for projection. There are a number of secondary monitors connected via splitter boxes. Until recently I was using the HDMI port for the primary monitor and all the secondary monitors were connected via VGA. However, I have just upgraded all the secondary monitors to HDMI (and changed the primary monitor to VGA) but I am getting some strange effects when I connect them. It seems that as I connect and disconnect HDMI monitors the Mac Mini randomly decides to switch the primary monitor from VGA to HDMI. Is there any way to fix the assignment of what is the primary monitor and what is the secondary ?

Hi Brian,
Thanks for using Apple Support Communities.  You can mirror the displays or make whichever display you want the primary in Extended Desktop mode.  See this article for details:
How to use multiple displays with your Mac
http://support.apple.com/kb/HT5019
The white bar at the top of the left blue box represents the menu bar and determines which display is your primary display. To change your primary display, click the white bar and drag and drop it on the blue box representing the display you would prefer to be your primary display.
Cheers,
- Ari

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