How to Reset Apple's Thunderbolt Display

Reset-Mac-Thunderbolt-DisplayApple's Thunderbolt Display, for myriad reasons, may not display an image from your Mac, recognize USB peripherals, connect to Ethernet, or power on whatsoever.

In many cases, the display is not broken. Before contacting Apple, follow these troubleshooting steps to see if you can reset your Thunderbolt Display.

Update OS X


OS X El Capitan LogoAs a preliminary measure, it is recommended that you update your Mac to the latest version of OS X.
  1. Click on the Apple logo in the top-left menu bar.
  2. Click on About This Mac in the dropdown menu.
  3. Click on the Software Update… button.
  4. Click on the Update button next to the latest OS X version in the Mac App Store.

Power Cycle for 30 Seconds


Thunderbolt-Display-RearShut down and disconnect both your Mac and Thunderbolt Display from AC power for at least 30 seconds.
  1. Disconnect the Thunderbolt Display's MagSafe cable from your Mac.
  2. Disconnect the Thunderbolt Display from AC power by unplugging the cord.
  3. Disconnect all USB peripherals and any cables plugged into the Thunderbolt Display.
  4. Wait at least 30 seconds before powering on your Mac and Thunderbolt Display.

Reset Your Mac's SMC


SMCIntel-based Macs have a System Management Controller (SMC) that can be reset as a possible fix for Thunderbolt Display issues.

These instructions are for Mac notebooks with non-removable batteries.
  1. Shut down the Mac.
  2. Plug in a MagSafe or USB-C power adapter to a power source and to your computer.
  3. On the Mac's built-in keyboard, press the left side Shift-Control-Option keys and the power button simultaneously.
  4. Release all the keys and the power button at the same time.
  5. Press the power button to turn on the Mac.
Apple provides steps for Macs with removable batteries, and the Mac Pro, iMac and Mac mini, on its support website.

On Macs with MagSafe power adapters, the cable's LED might change states or temporarily turn off when you reset the SMC.

Reset Your Mac's NVRAM or PRAM


NVRAMNVRAM, short for "non-volatile random-access memory," stores certain settings even when your Intel-based Mac is turned off. On older Macs, it is known as PRAM.
  1. Shut down the Mac.
  2. Turn on the Mac.
  3. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
  4. Hold these keys until the Mac restarts and you hear the startup sound for a second time.
  5. Release the keys.
After resetting NVRAM, you may need to reconfigure the Mac's settings for speaker volume, screen resolution, startup disk selection, and time zone information.

Thunderbolt-Cable

Use a Standalone Thunderbolt Cable


Try connecting a standalone Thunderbolt cable between your Mac and Thunderbolt Display. If this resolves the issue, then possibly your Thunderbolt Display's dual MagSafe-Thunderbolt cable is damaged.

Contact Apple


If none of the troubleshooting methods worked above, it is recommended that you contact Apple Support by calling 1-800-MY-APPLE, scheduling a Genius Bar appointment or choosing another option. You may also consider visiting an Apple Authorized Service Provider if your Thunderbolt Display requires repair.



Top Rated Comments

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26 weeks ago
4 1/2 year old, $1000 monitor needs an 18 step trouble shoot.
Unbelievably sad.
Rating: 14 Votes
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26 weeks ago
Dammit I thought this was an announcement for a new Thunderbolt Display when I saw the picture.
Rating: 9 Votes
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26 weeks ago

Does your 3rd party display provide power, USB, Thunderbolt, ethernet, and Firewire 800 to your MacBook Pro? Is it a work of art destined for some modern art museum? Does it have the simplicity of only needing two cables to operate? No? Then maybe the $1,000 piece of glass is worth it. Was to me. I'm a digital media editor (photos, videos) and a musician. Some things are a necessity.


Mine does. Everything except Firewire. Since I never used Firewire, I can honestly say 3440x1440 resolution, 2 thunderbolt ports, better screen, better speakers, more connectivity options, etc. are worth it. Of course, some would argue firewire 800 is more precious than those things mentioned here.

And btw, I had Apple Thunderbolt Display. After 2 years it died on me. Sometimes it would turn on, sometimes it wouldn't. Upgrading firmware, smc reset, 1000x more things and it finally died on me. You have a long thread about this issue on apple forums. Lots of people with exact same situation I was in.

Do you think Apple reacted to this? Of course not.

Will I ever buy Apple monitor again? Nope. I payed premium expecting a premium product and a premium support. Got neither. Glossy screen with large bezels that was pretty expensive couldn't last me 2 years. With so many great monitors out there that support thunderbolt 2, and so many coming out that will support thunderbolt 3, I really see no reason in waiting and finally purchasing a monitor from Apple.

Not with their past record. And besides, they aren't interested anymore in monitors or pro users. They have their iToys to play with now :)
Rating: 8 Votes
Avatar
26 weeks ago
What a ridiculous article this is. It doesn't even actually include the one thing suggested by the title: resetting the display. How can these guys expect us to take them seriously? They are either engaging in blatant click-baiting or they don't understand the difference between resetting a display and resetting the computer that is connected to the display. Either way, MacRumors should be embarrassed by this post.
Rating: 8 Votes
Avatar
26 weeks ago
The best fix is to buy a 3rd party 4K display.
Rating: 7 Votes
Avatar
26 weeks ago

4 1/2 year old, $1000 monitor needs an 18 step trouble shoot.
Unbelievably sad.


The only thing that is sad is how many people are bashing an article designed to help users. How very pathetic. Does it make people feel "good" about themselves to always want to bash and hate?
Rating: 6 Votes
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26 weeks ago
Hasn't this display been out since 2011? Why is this news now?
Rating: 6 Votes
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26 weeks ago
Does your 3rd party display provide power, USB, Thunderbolt, ethernet, and Firewire 800 to your MacBook Pro? Is it a work of art destined for some modern art museum? Does it have the simplicity of only needing two cables to operate? No? Then maybe the $1,000 piece of glass is worth it. Was to me. I'm a digital media editor (photos, videos) and a musician. Some things are a necessity.
Rating: 4 Votes
Avatar
26 weeks ago

Hasn't this display been out since 2011? Why is this news now?


My Apple Monitor II isn't working right with my Apple IIe, and I can't figure out what to do. Where's the how-to article on that?! :p

But seriously, there are tons of people who still have and use the Thundebolt display (Apple still sells it), so I assume that's why this article was posted. The fact that it's not breaking news is why it was done on a "slow news day" and not as a front-page article.
Rating: 2 Votes
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26 weeks ago

I think you are missing my point, which is that the headline misrepresents the content of the article. If they wanted to give an incredibly basic and generic "tip" that amounts to the Dell support guy telling you to unplug your computer and then to plug it back in, well, then I guess could do that, but to present this as "a way to reset" a very specific make and model of display - well, that's crap.

The article explains exactly how to reset the display and I even quoted it to you in post #32 above. And that is exactly what the title says the article is about. I honestly don't see what your issue is here. If the article does not interest you, you could just skip it.

I have owned a TBD since March 2012 and did not know how to reset, so the article was of interest to me.
Rating: 2 Votes
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