How do i go about troubleshooting a 27" LED cinema display?

I am using a MacPro 5,1 (the tower, NOT the MacBook) with a 2.8 Ghz Quad-Core Intel Xeon processor. I have a 27" LED Cinema Display (2048x1152) connected by the display port. Both were purchased new in 2011.
A while back (a year, maybe) my display refused to work. I unplugged the display from the power source and reconnected the port. I switched to the other port, but nothing seemed to work. Luckily, I have an extra, identical display (which was purchased at the same time as the original). I connected the extra to the computer and viola! Works perfectly. Okay, so there was something wrong with the display. I set it aside to figure out later (which we all know means it just sat in the corner collecting dust)
Here's where it gets weird. Several months down the road, I come in to work and the exact same thing happens. Except now, I'm swapping out with the original display. It works! So the extra monitor gets shuffled to the corner to do the dust collecting.
So, now here I am again, several months later. I come in this morning and no display. I plug in the extra display and wouldn't you know it, it inexplicably works.
I don't believe it is either of the ports on the tower. But I also don't believe it's the cables or the display. I kind of think there may be some sort of pixie or trickster playing pranks and giggling at my confusion. More likely there's some sort of technical explanation, but I'm not clever enough to figure it out. Any sort of advice, suggestions or protection spells would be appreciated.
If any more information about the hardware is required, just let me know.
Thanks!

If you have a USB keyboard, you can plug that in to the back of the Cinema display to adjust the brightness.

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