Display works with laptop and Mac Pro but not my iMac

I have a 27" non-Thunderbolt display (bought refurbished a couple years ago). If I plug it into my 2011 MacBook Pro or 2009 Mac Pro, it works fine. I just bought a 27" iMac, and it won't display there. Oddly enough, it has power; and three different external hard drives connected to the black-screen display show on the desktop of my iMac. Also, I can use the black-screen display's speakers.

I've tried plugging it into both of the iMac's display ports. Nothing. I've plugged another display into the same ports, and that display worked. So weird. I appreciate your insight and advice!

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Yes, strange issue. I'd go into system preferences,m turn mirroring on, that failing, just play with the display setting. Not a definitive answer by any means.

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