Q: Dell U2412M monitor goes into Power Save Mode once connected to iMac 21,5 Mid 2011

I am trying to connect my iMac 21,5 Mid 2011 to a Dell U2412M monitor using a thundrebolt to DVI adapter but monitor just goes into Power Save Mode!

I need to find a solution as it is really frustrating!

Graphic card is AMD Radeon HD 6750M 512 MB.

Using all the same parts my Mac Mini 2012 has no problem recognizing the Dell monitor in full resolution (1920x1200). On the it just refuses to work! Never seen it work!

Has anybody managed to work this monitor as a secondary on an iMac or had a similar problem?

iMac, OS X Yosemite (10.10.3), 21.5, Mid 2011, 2,5 GHz, AMD Radeon

Posted on Jun 12, 2015 2:26 PM

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Q: Dell U2412M monitor goes into Power Save Mode once connected to iMac 21,5 Mid 2011

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by Allen A,

Allen A Jun 14, 2015 1:45 PM in response to VD1979
Community Specialists

Jun 14, 2015 1:45 PM in response to VD1979

Hi VD1979,

As you've isolated the source of the issue to your iMac, the article linked below details a number of troubleshooting steps that can help get your display to work correctly with your iMac.

Apple computers: Troubleshooting issues with video on internal or external displays
https://support.apple.com/en-us/HT201177

All my best,
Allen
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by VD1979,

VD1979 Jun 21, 2015 11:18 AM in response to Allen A
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Jun 21, 2015 11:18 AM in response to Allen A

Thank you Allen!

I have tried all! Even reset the RAM!

Unfortunately the second monitor still goes into sleep mode!

So my question still stands!
Any suggestions or experiences will be most helpful!
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by Allen A,

Allen A Jun 21, 2015 12:17 PM in response to VD1979
Community Specialists

Jun 21, 2015 12:17 PM in response to VD1979

VD1979,

Thank you for using the Apple Support Community. Due to the nature of your issue or question you may find more information by using another one of Apple's support resources - https://getsupport.apple.com/GetproductgroupList.action.

All my best,
Allen
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Q: Dell U2412M monitor goes into Power Save Mode once connected to iMac 21,5 Mid 2011

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by Allen A,

by VD1979,

by Allen A,

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