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Q: Dell U2715H cannot be connected to iMac 21.5inch(2015) through thunderbolt 2 port

When I connect the Dell U2715H monitor to a new iMac 21.5inch (lat 2015), it shows "Entering power save mode" and there is nothing then ....

 

However, the iMac obviously recognizes the Dell monitor:

Screen Shot 2016-03-04 at 3.58.06 PM.png

 

the cable connection is like the following:

1. the mini displayport end of the cable is connected to the Thunderbolt 2 port on iMac

2 .the displayport end of the cable is connected to the displayport on the Dell monitor (see images below)

IMG_6553.JPG

IMG_6554.JPG


This is frustrating because I have this monitor connected with a relatively older iMac (2009) before, and it can also be connected to my Macbook Air though its thunderbolt port:

Re: can iMac (21.5-inch 2009) connect to Dell U2715H

 

I don't know why this time the same cable and the same connection method doesn't work...

 

Is it because thunderbolt2 port doesn't recognize mini display port?

 

I also tried to use miniDisplayPort-to-miniDisplayPort cable to connect the two, and it still doesn't work.

 

The only cable works is the miniDisplayPort-to-HDMI

cable, but this makes the Dell resolution reduced and I can't utilize its highest resolution...

 

Help is greatly appreciated !

 

Thank you very much!

iMac (Retina 4K, 21.5-inch, Late 2015), OS X El Capitan (10.11.3)

Posted on Mar 4, 2016 12:21 AM

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Q: Dell U2715H cannot be connected to iMac 21.5inch(2015) through thunderbolt 2 port

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