Sep 27, 2020 Step 3: Now, all apps that need updates will be listed here and just click on the “Update” button next to those apps you want to update. 3.3- Delete and Reinstall the App: If the app isn’t responding even after trying the above solutions, then it’s time to delete the app and reinstall it.

• Photos On Mac Won't Open
• Updated Mac And Now Apps Wont Opening
• Application Won't Open On Mac
• Why Won't An App Open
• Updated Mac And Now Apps Won't Open Chrome

Mac fails to boot or start after the macOS update. Whatever is preventing your Mac from starting up, follow these 5 simple solutions to get it working again. If you have data loss problem after macOS update, EaseUS Data Recovery Wizard for Mac provides tried-and-true data recovery service to you.

This page covers 5 fixes for Mac won't boot or start issue after macOS Catalina, Sierra or older macOS update issue. If you are with this issue, follow to make your Mac computer work now:

macOS has now been updated to 10.15, and many Mac users are trying to upgrade to the newest version. While for most it’s a usual pleasurable experience, for some this update had downsides. Some users complain that their Mac computers won't boot after installing new macOS Catalina. When Mac fails, it usually can't boot or start up properly. If you are faced with this situation, the most important thing should be recovering data from the unbootable Mac because:

• Your attempts to fix the Mac not booting issue may write new data on this Mac, which will overwrite the old data and make it irrecoverable.
• Recovering data before the complex fixes can avoid data loss.

EaseUS Mac data recovery software is able to recover data from unbootable Macs after update. It creates a bootable media that enables you to recover data from Mac hard drive (If you only have one Mac). What's more, it recovers data from failed internal Mac hard drive, APFS boot drive, and unmountable APFS boot volume, etc. If you have two Mac devices, take out the hard drive and connect it to the other Mac. Download EaseUS Data Recovery Wizard for Mac on that Mac device, and recover data from the hard drive.

Then, you can read on and Fix the 'Mac won't boot after update' issue after you have successfully got data from the drive.

1. Reset the PRAM / NVRAM

NVRAM refers to special memory sections on your Mac that store data that persists even when the Mac is shut off, such as volume settings and screen resolution. Resetting that data isn't harmful! In some cases, after performing this step, your Mac will restart normally.

Photos On Mac Won't Open

• Restart your Mac
• Hold down all of these keys: 'Command', 'Option', 'P' and 'R', and turn on the Mac. (It's the same keys to reset the PRAM).
• Keep holding the keys down until you hear the Mac restart again.

You may see a progress bar on startup. If the progress bar fills up and then the Mac starts up, you're probably good to go. If not, reset SMC.

2. Reset the SMC

In some situations, you may need to reset your Mac's SMC (System Management Controller).

• Shut the Mac down.
• Unplug all cables.
• Wait for a few minutes.
• Plug the cables back in and start up the Mac.

If you've got a Mac desktop, unplug it for 15 seconds and then plug it in and after five seconds press the power button.

3. Boot Mac in Safe Mode

Safe Mode is a stripped-down version of the Mac operating system that can be useful if you are trying to troubleshoot issues with your Mac.

• Start your Mac, press and hold the 'Shift' key, and make sure your Mac has at least 9 GB of free space.
• When the login window appears to release the shift key and log in. You may be required to log in twice if you have FileVault turned on. Then restart the device.

Wait patiently till Mac computer finish the reboot process.

4. Run Disk Utility in Recovery Mode

If your Mac is booting but the operating system isn't loading up, you may have a corrupted drive. Luckily it is possible to fix this in Recovery Mode. In Recovery Mode you can restore from a Time Machine backup, use Disk Utility to verify and repair connected drives, check your internet connection, get help online using Safari, and install or reinstall macOS.

• Make sure the Mac is off. If it's stuck on a grey, blue or white screen, just hold down Mac's power button for several seconds until it shuts off.
• Hold down the 'Command' and 'R' keys, and power the Mac back up again. Keep pressing 'Cmd' + 'R' while your Mac is booting up.
• Once your Mac starts in Recovery Mode you can have access to 'Utilities'. Click 'Disk Utility', locate the icon for your Mac's drive, and click 'Verify Disk'.

5. Reinstall macOS Catalina/Sierra

The last method to fix macOS Catalina or Sierra fails to boot after update error is to reinstall macOS.

• You can download wanted macOS Catalina/Sierra and create a bootable USB drive to clean install macOS Catalina/Sierra on your computer again.
• You can also boot into Recovery mode (Solution 4), and then click to install the latest OS and follow the onscreen prompts. Our article on resetting a Mac to factory settings has more information on reinstalling macOS.

If your Mac does not respond after trying these tips, contact Apple Support or a certified Apple Repair Center. It’s likely there is a problem with your logic board or other internal hardware.

As Mac OS X users, we have something to be happy about when it comes to app crashes and freezes: rarity. Typically you can work on your Mac for hours at a time without a single issue. However, a crashing app certainly can happen, leading to lost productivity, time and, worst of all, lost work. Fortunately, there are several steps you can take to recover from a crashed app, as well as prevent the issue in the first place.

How to fix a crashing app after the macOS upgrade

App crashes after the the macOS update is more than a common problem. Some apps freeze or malfunction, some won’t launch, some show no signs of life whatsoever. Why it happens? The most probable reason is that the app is simply not ready for the latest macOS Catalina. Something in its depth turned out to be incompatible with the new macOS.

Now, what can you do to fix an app crashing? Three things.

1. First, see if you have the latest version of the app by clicking on its name it the top menu and choosing Check for updates.
2. Second, visit developer’s website (or App Store page) and see if they’ve issued a statement about Catalina compatibility.
3. Finally, some crashed apps on macOS Catalina can be fixed by running maintenance scripts. Download CleanMyMac X, launch it, find Maintenance tab and run the scripts.

What happens when an app craches: under the hood

Now let's go deeper into the nature of crashed apps, but first, let’s identify the difference between a crashed macOS app and a frozen one. While these terms are often used interchangeably, there is a notable difference.

Crash

A crash happens when a piece of software stops working altogether, and then closes on its own. In other words, the app quits when you did not tell it to. When this happens, you'll typically see a message noting that the application has 'unexpectedly quit” just as its windows disappears. It’s pretty frustrating — especially if you end up losing all your work.

Freeze

A freeze is when software stops functioning, but continues to run. You can still see its windows, and its Dock icon still indicates that it’s running. However, no amount of clicking or tabbing around will do anything. A frozen app doesn’t quit like a crashed app does, it simply becomes unresponsive. Often no error messages accompany the freeze. Again, it’s a frustrating experience (if you want to know how to deal with it, check out this post on how to fix frozen apps).

When software freezes, you force it to quit, so that you can re-launch and hopefully get on with your work. With crashes, meanwhile, the problem is the app quitting on its own. In this article, I’ll discuss recovering from app crashes, as well as steps that help prevent them in the first place. Let’s get started.

What to do when a Mac OS X app crashes

The good news here is that a crashed app rarely brings down your entire Mac, as the trouble is restricted to that particular piece of software. That means we have a chance to recover. Let’s start with the simplest solutions.

First, just relaunch the app. When an app crashes, you’ll typically see a dialog box that says the software “unexpectedly quit” and you’ll have several options to deal with it, including “Relaunch”. Give that a click and cross your fingers that the crash doesn’t happen again. Oftentimes, you’re good from there. If not…

Try restarting your Mac. “Turn if off and back on again” is almost a punchline at this point, but it usually works. Shut down, restart and try again. Very often this simple task will set things right. If not, it’s time to try something just a little more involved.

Reinstall the app. Deleting the misbehaving app and grabbing a new copy gives you a fresh version to work with. That is, if you delete all of the app’s related files.

See, when you drag an app to the Trash, you aren’t deleting everything. Some leftover parts remain, and if the troublemaker is among them, your problem could persist. It’s a waste of time to delete an app via drag-and-drop, reinstall and then have it crash again. To make things right, you need to get rid of the app’s bits and pieces before you reinstall it, and this is where software like CleanMyMac X comes in handy.

An app that’s simply dragged to the Trash leaves behind a pile of associated files that you don’t see, like caches, preferences (often the culprit in crash-y apps), saved states, and more. You might not even know they’re there, but CleanMyMac X does. It’s smart enough to find the whole lot, safely remove them, and ensure that a newly installed app is just that: a complete fresh start.

In fact, you don’t even have to launch CleanMyMac X to thoroughly and safely delete an app. Simply right-click (or Control-click) the app’s icon and select “Uninstall with CleanMyMac” from Services in the resulting contextual menu. Easy!

Updated Mac And Now Apps Wont Opening

Another wise move is to make sure there are no conflicts between the app and the Mac OS. When Apple pushes an update of its operating system to your Mac, that might interfere with your app’s performance, if the app or its add-ons are incompatible with this particular OS X version.

CleanMyMac can help you out here, too. Download it for free, go to its Uninstaller module and find the misbehaving app in the list. If you see a note that this app is incompatible with your system, it means you need to update the app, because your current version doesn’t work on the latest OS X.

How can you stay on top of aging apps? Apple makes it easy with software purchased through the Mac App Store. Simply launch the App Store app, go to the Updates tab, and you’ll see all available app updates. Find the one you need in the list, click the Update button, and you’ll get the latest version to your Mac. It’s a bit different with software acquired outside the App Store: you’ll have to visit the vendor’s website to see if there’s a new version available.

If nothing indicates that the troublemaker app is incompatible with your system, the problem could be with its add-ons or preferences. What you can do in this case is reset the app to its initial state. Again, go to the Uninstaller module in CleanMyMac X, select your app, and click Application Reset. CleanMyMac will make that app just the way it was when you first installed it.

What to do when an app crashes at launch

So far I’ve addressed what to do when an app crashes as you’re using it. But what about the frustrating scenario of an app going down as soon as you launch it? No warning, no dialog box, just a bounce or two in the Dock and that’s it. In this case, it’s time to repair disk permissions.

Application Won't Open On Mac

What’s does fixing permissions actually mean? Think of your Mac’s hard drive as a tree with many branches. The top level of your drive is the tree’s trunk, and the branches represent information about files and folders. These branches, or “nodes,” store information like the location of data and permission rules, among other things. Normal computer use changes this information, and can lead to a conflict or other issue that generates crashes and the inability to use your system. This is what a permission fix addresses.

Why Won't An App Open

To repair disk permissions (for OS X prior to El Captian), go to the Utilities in your Mac’s Applications folder and launch Disk Utility. Next, click First Aid. It’ll ask for confirmation and get to work, comparing existing permission files with defaults to find any conflicts.

Or, if you want a slightly simpler way, you can fix the permissions with CleanMyMac X Maintenance Scripts. Just open the Maintenance tab, hit Choose Tasks and then Repair Disk Permissions. This helps resolve improper app behavior like crashing and keeps all of your disk’s files and folders in proper order. And that’s just one of the maintenance tasks available in CleanMyMac X, just try it.

A crashing app is no fun. Fortunately, a little understanding and proactive behavior can keep them to a minimum. CleanMyMac X makes it easy to do just that. Happy computing, and may your apps never crash again!

Updated Mac And Now Apps Won't Open Chrome

These might also interest you: