If this resolves the issue, then possibly your Thunderbolt Display's dual MagSafe-Thunderbolt cable is damaged. Try connecting a standalone Thunderbolt cable between your Mac and Thunderbolt Display. Hold these keys until the Mac restarts and you hear the startup sound for a second time.Īfter resetting NVRAM, you may need to reconfigure the Mac's settings for speaker volume, screen resolution, startup disk selection, and time zone information.Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.NVRAM, short for "non-volatile random-access memory," stores certain settings even when your Intel-based Mac is turned off. On Macs with MagSafe power adapters, the cable's LED might change states or temporarily turn off when you reset the SMC. Press the power button to turn on the Mac.Īpple provides steps for Macs with removable batteries, and the Mac Pro, iMac and Mac mini, on its support website.Release all the keys and the power button at the same time.On the Mac's built-in keyboard, press the left side Shift-Control-Option keys and the power button simultaneously.Plug in a MagSafe or USB-C power adapter to a power source and to your computer.These instructions are for Mac notebooks with non-removable batteries. Intel-based Macs have a System Management Controller (SMC) that can be reset as a possible fix for Thunderbolt Display issues. Wait at least 30 seconds before powering on your Mac and Thunderbolt Display.Disconnect all USB peripherals and any cables plugged into the Thunderbolt Display.Disconnect the Thunderbolt Display from AC power by unplugging the cord.
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