You might be surprised at how many times turning your Mac off and back on fixes issues such as display problems. Restarting your Mac puts everything back to a known state. It clears out both the system and graphics RAM, resets the graphics processing unit GPU and the central processing unit CPU , and then restarts everything in orderly steps. This may seem obvious, but if you're using a separate display, one not built into your Mac, you should check that it's turned on, the brightness is turned up, and that it's properly connected to your Mac.
You may scoff at the idea that a cable came loose or the power somehow was turned off, but kids, adults, and pets have all been known to accidentally unplug a cable or two, push a power button, or walk across a power strip switch. If you're using a display that is an integral part of your Mac, make sure the brightness is set correctly, if you can.
The SMC controls a built-in display's backlighting, detects ambient lighting, and adjusts brightness, controls sleep modes, detects the lid position of Mac laptops, and a few other conditions that can affect a Mac display. Reset using the guide: Use Safe Mode to isolate graphics issues you may be having. In Safe Mode, your Mac boots into a stripped down version of the Mac OS that only loads the bare minimum of extensions, disables most fonts, clears out many of the system caches, keeps all startup items for starting, and deletes the dynamic loader cache, which is a known culprit in some display problems.
How do I restore the display settings - Apple Community
Before testing in Safe Mode, disconnect all external peripherals connected to your Mac, except for the keyboard, mouse or trackpad, and the display. Start the Mac in Safe Mode following the guide: After your Mac restarts in Safe Mode, check to see if any of the graphics anomalies are still occurring.
If you're still experiencing the problems, you have a possible hardware issue.
Jump ahead to the Hardware Issues section. If the graphics problems appear to be gone, then your problem is likely software-related.
macOS: Finding the Hidden Advanced Display Preferences
Check any new software you've added, including Mac OS software updates, to see if they have any known issues with your Mac model or with software you're using. Most software manufacturers have support sites you can check. Apple has both a support site and support forums where you can see if other Mac users are reporting similar issues. Restart your Mac in normal mode, and then run your Mac with only basic apps, such as email and a web browser.
If all works well, add any apps you use that may have helped cause the graphics issue one at a time. Got a tip for us? Let us know a. Send us an email b. Anonymous form close x. Apple'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. Click on the Apple logo in the top-left menu bar. Click on About This Mac in the dropdown menu.
Click on the Software Update… button. Disconnect the Thunderbolt Display from AC power by unplugging the cord. Wait at least 30 seconds before powering on your Mac and Thunderbolt Display. These instructions are for Mac notebooks with non-removable batteries. Shut down the Mac. 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.
Apple provides steps for Macs with removable batteries, and the Mac Pro, iMac and Mac mini, on its support website. 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.
Learn how to deal with software- and hardware-related display problems
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.
If this resolves the issue, then possibly your Thunderbolt Display's dual MagSafe-Thunderbolt cable is damaged. Top Rated Comments View all. Bubba Satori. Dammit I thought this was an announcement for a new Thunderbolt Display when I saw the picture. Mine does. Everything except Firewire.
Using the Option Key in Display Preferences
Since I never used Firewire, I can honestly say x resolution, 2 thunderbolt ports, better screen, better speakers, more connectivity options, etc. Of course, some would argue firewire 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, x 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? 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: What a ridiculous article this is. It doesn't even actually include the one thing suggested by the title: 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.