Mac mini doesn't recognize the second monitor

I have Mac mini mid 2011 with dual display setup - one HDMI, the Second one thunderbolt to DVI adapter.
Majority of times it doesn't recognize the second monitor connected through thunderbolt. Sometimes it start suddenly after a while, I've read there are some issues with the 10.10.2 Yosemite...
Any  suggestions how to sort it out please? Many thanks, this is really a pain in the *** for me, strugling for a half an hour with a monitor...

Thanks lllaass I tried it but doesn't work. I tried with different cables, still doesn't work.
The strange thing is that sometimes it suddenly starts and works smoothly... Really strange problem. I will try a new adapter Thunderbolt to HDMI....
What is the worst, when both monitors work smoothly and I put the computer to sleep or i shut it down, when started all over the monitor is not recognized.
Ehhh :-(

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