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Feb 18, 2014 6:44 AM in response to emathieby sterling r,Hello emathie,
It sounds like your Cinema Display is no longer consistently recognizing the computer when it is plugged in, as it used to. I recommend these troubleshooting steps specifically from the article named:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
- Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
- 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 resolutionStart 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.
Thank you for using Apple Support Communities.
Take care,
Sterling
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Feb 18, 2014 4:43 PM in response to emathieby turbostar,Reads like your actual display is about to burn out
