Default of 2 Monitors on MBP

I have 2 external monitors on my MBP/Retina when at my desk. One is connected via the Thunderbolt, the other HDMI.  When I boot in clamshell mode sometimes monitor A is the "main" screen, sometimes monitor B is the main screen.
Is there any way to tell the MBP to always use monitor A as the primary screen?
Thanks,
Will

Have you tried switching the cards around? Swap two cards, see if the problem persists or perhaps other monitors start showing the problem...

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