Mac mini will not boot up with two monitors attached

New Mac mini running OS 10.10.1. I have a LCD monitor attached to the HDMI port, and a Cintiq 21 UX LCD monitor attached to a thunderbolt port.
It boots up properly with only the first LCD monitor attached to the HDMI port.
When I leave both monitors connected before starting the computer I get no chime, and a black screen. The light on the front of the Mac mini comes on, but nothing else happens. I have to turn off the Mac mini, unplug the second monitor and then reboot. It always starts up perfectly then. After starting the computer, I plug the second monitor in, and everything is fine.
It’s kind of a pain in the neck to constantly plug and unplug the second monitor from the back of the Mac mini. Is there anything I’m overlooking?

Thank you, Illaass! Resetting the SMC solved the problem! I tried that first because I would prefer not to lose any preferences, and also because it was the easiest to try. You must be a genius in addition to being such a good egg!
(This is the number of smiles I smiled after my Mac mini booted properly with both monitors connected.)

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Mac mini will not boot up with two monitors attached

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