LG Monitor entering power saving mode despite thunderbolt connection

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LG Monitor entering power saving mode despite thunderbolt connection

I have a full boat 2013 rMBP connected to a LG 34UM95 though thunderbolt and it has been working flawlessly for about 4 months. One connection from the laptop to the monitor and my external drives connected to the monitor. It has been great.

Until today

For whatever reason, my rMBP isn't detecting the monitor. It isn't showing up in preference or apple menu. I know the thunderbolt port is working as the drives are still visible that are connected to the monitor, but I can't run dual display or clamshell mode. I have rebooted several times, both the monitor and laptop.

This *****.

Any suggestions?

The searching I have done has revealed some NVIDIA card issues causing some challenges for others, so I hope it isn't anything like that.

MacBook Pro with Retina display, iOS 7.0.3, 2.6 / 1tb / 16gb

Posted on Nov 1, 2014 9:32 AM

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Answer 1

mario49

Community Specialist

Nov 4, 2014 6:45 AM in response to Cult Hero

Hey Cult Hero,

Thanks for the question. Based on what you stated, it seems like you are having trouble with an external display. I would recommend that you read this article, it may be able to help you isolate or resolve the issue.

Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support

No video or no signal, image distortion, "snow," or flickering

Check connections

When using an external display be sure to check the following:

If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.

Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:

Monitor and Display Adapter Table

About Mini DisplayPort to HDMI adapters

Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)

Thunderbolt ports and displays: Frequently asked questions (FAQ)

Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.

Try unplugging the video adapter or cable and then plug it back in.

If more than one video adapter is in use (or "daisy-chained"), troubleshoot by using only one adapter.
Example: A mini DisplayPort to DVI adapter connected to a DVI to HDMI adapter is an unsupported configuration because there is a series of adapters in use.

If available, try using a different display and or adapter (or use a different connector by using DVI instead of VGA, for instance).

Reset the system

You can reset the Mac's parameter RAM and SMC.

Reset the resolution

Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:

Start up in Safe Mode.

From the Apple () menu, choose System Preferences.

Choose Displays from the View menu to open the preferences pane.

Select any resolution and refresh rate that your display supports.

Restart your computer.

Thanks for using Apple Support Communities.

Cheers,

Mario

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