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Q: MacBook Air not connecting to Thunderbolt display
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Jul 18, 2015 1:57 PMby alex_h1,Hello etjNC,
Thanks for using Apple Support Communities.
Given you have already confirmed that the Thunderbolt display is functioning on one Mac but not the MacBook Air you want it to, then I'd like you to please follow the steps below on the MacBook Air.
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.
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Have a great weekend.
