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#1
03-24-2020, 03:19 PM
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OT: Thunder Bolt Display is not recognized by MacBook Pro
I moved my office downstairs. I have a MacBook Pro with the USB C and the lastest Catalina OS. I have an old Thunderbolt monitor that I use as its display when I have my laptop on at my desk. I have the toggle that marries the Thunderbolt video connector to a USB C. In the past it is plug and play. I plug the monitor into the laptop and there you go. I cannot get it to work. I have run through all the traps and nothing seems to work. Anyone can help me?
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***IG: mttamgrams*** Last edited by joosttx; 03-24-2020 at 03:22 PM. 
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#2
03-24-2020, 03:53 PM
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Did you plug the UBC C cord directly into the Mac?
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#5
03-24-2020, 04:25 PM
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***IG: mttamgrams***
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#6
03-24-2020, 04:27 PM
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Apple is really confusing because they'll take plug standards and modify them slightly. Thunderbolt is a great example. Found this on wikipedia: https://en.wikipedia.org/wiki/Apple_..._compatibility
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Last edited by sonicCows; 03-24-2020 at 04:30 PM.
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#7
03-24-2020, 04:40 PM
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It is offical and worked about a month ago. I just moved my office downstairs and now it does not. I checked the plugs and all that.
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***IG: mttamgrams***
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#8
03-24-2020, 04:45 PM
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Are you using the official $49 Apple Thunderbolt 3 to 2 adapter?
https://www.apple.com/shop/product/M...bolt-2-adapter Sometimes you have to cold boot Thunderbolt displays as well just like a computer or router. Unplug it from power for 30 seconds then plug it back in. Then plug it into the laptop. Do you have another Mac that you can plug the display into to verify that the display is working? An older MacBook Air or Pro that uses Thunderbolt 2? Is the brightness somehow turned all the way down on the 27" Thunderbolt display? Also try plugging in an external keyboard, if you have an older Mac wired model that has brightness keys on it. Cold boot the MacBook Pro as well. Try all four ports, or two if it's a 13" model. Do the four ports work for other devices? A wired mouse using a usb-c to usb-a adapter, a thumb drive, etc.
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#9
03-24-2020, 04:48 PM
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Old article but may be applicable to your situation.
https://www.cnet.com/news/tutorial-p...omplete-story/ In simplest terms its where the settings of all your workings are stored. Files are suffixed .plist. Search around for how to discard your video prefs.
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#10
03-24-2020, 05:01 PM
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Agree on try another port after a restart of both.
I'd check system preferences as well as system report to see if it's recognized under displays. Lastly, double check that the power/thunderbolt plug on the back of the monitor is pushed in all the way. Love my TBD.
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#11
03-24-2020, 08:07 PM
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2) Cold boots both display and computer and used all ports. 3) tried another macbook pro nothing 4) checked the brightness 5) pulled in a thumb drive in the back of the Display. THe thumb drive not light up or show up on the computer. seems like it is not getting power.
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***IG: mttamgrams***
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#12
03-24-2020, 08:08 PM
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I did double check the plug in the back of the display it plugged in
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***IG: mttamgrams***
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#13
03-24-2020, 08:10 PM
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Apple logo->About this mac->System report-> then look under Graphics/Displays or Thunderbolt to see if it's registering as connected.
Here is my macbook air connected to TBD. Caveat it's a 2017 and I'm not using a USB-C dongle.  
Last edited by kppolich; 03-24-2020 at 08:13 PM.
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#14
03-24-2020, 08:24 PM
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Quote:
 Screen Shot 2020-03-24 at 7.22.41 PM by Houston Joost, on Flickr Screen Shot 2020-03-24 at 7.21.42 PM by Houston Joost, on Flickr Screen Shot 2020-03-24 at 7.21.34 PM by Houston Joost, on Flickr
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***IG: mttamgrams***
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#15
03-24-2020, 08:35 PM
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Want to check out System Preferences->Network and see if there are any wonky Thudnerbolt bridge's setup?
Do you have anything else plugged into the Display? I also thought about having you try to turn up the brightness on the MBP as I hear USB-C lets your control the TBD brightness as well. But since it isnt showing up at all under System Report I doubt that would do anything at all. Final 2 options I have for you are: 1.) Reset Your Mac's SMC: SMC Intel-based Macs have a System Management Controller (SMC) that can be reset as a possible fix for Thunderbolt Display issues. Steps: Shut down the Mac. Plug in a MagSafe or USB-C power adapter to a power source and to your computer. On the Mac's built-in keyboard, press the left side Shift-Control-Option keys and the power button simultaneously. Release all the keys and the power button at the same time. Press the power button to turn on the Mac. or 2.) Reset Your Mac's NVRAM or PRAM NVRAM, 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. Steps: Shut down the Mac. Turn on the Mac. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound. Hold these keys until the Mac restarts and you hear the startup sound for a second time. 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. Last edited by kppolich; 03-24-2020 at 08:42 PM.
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