- An App Isn't Showing Up In Activity Monitor On Mac Download
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Feb 28, 2017 Activity Monitor will ask if you are sure you want to quit this process. If you click Quit, it will try to quit the app in the normal manner. If this doesn’t work, click Force Quit, and, in almost all cases, Activity Monitor will be able to quit the app, removing the offending laggard. The Memory Tab. Apr 15, 2019 The Energy pane of Activity Monitor is your Mac’s resource monitor. It shows overall energy use and power used by each app. It shows overall energy use and power used by each app. You’ll see the Energy Impact of running apps, along with the Avg Energy Impact of each app over the last eight hours or when your Mac booted up, whichever is shorter.
Last week the Rocket Yard showed you how to pinpoint troublesome iOS apps — using too much power, consuming your storage, or crashing frequently — and remove them from your device. Today, we’ll show you how to do the same thing on a Mac.
For macOS, the Activity Monitor app is the best way to find out what’s dominating your system resources. This useful utility is found in the Utilities folder in the Applications folder — from the Finder, select Go > Utilities or use the Shift-Command-U keyboard shortcut to find the app. Even easier, use the Command-Spacebar shortcut to bring up the Spotlight search bar, type the words “activity monitor”, then press Return to launch the app.
- This isn’t an exact science. But if my Mac’s going too slow, and I see, say, iTunes is up there gobbling up 90 percent or more of my CPU, I’ll gladly shut the app down to see if that.
- Oct 18, 2019 Open the Activity app on your iPhone. Tap the History tab to see details about your all day activity. On the calendar, a green dot appears next to the days that you worked out. To see more detail, tap a day. To get information about a workout, such as your route or total distance, tap the Workouts tab, then tap the item.
By default, Activity Monitor displays a list of running processes by the amount of CPU (Central Processing Unit) load each process is using (see screenshot above). Some of these processes are apps; others are background processes that run continuously. In some cases, a process may have multiple instances running at once (for example, Google Chrome Helper and https://facebook.com).
The CPU percentages are updated about once every five seconds, so it can sometimes be confusing to determine which app is dominating the Mac’s processor. By selecting View > All Processes, Hierarchically from the menu bar, CPU usage is sorted by app or process so all similar processes (example: Google Chrome Helper) are clustered together. By collapsing the processes by app, it’s possible to see how all of those instances add up.
Activity Monitor doesn’t just display CPU activity; the tabs at the top of the window also display memory (RAM) usage, energy usage, disk (storage) use, and even network activity.
For Apple notebook owners, knowing how RAM is being used and how each app affects battery life are extremely important. Clicking on the Energy tab indicates that at least on my Mac, the browsers (Google Chrome and Safari) are big power users (see screenshot below).(The Energy Tab in Activity Monitor shows the energy usage impact of each app or process.)
Activity Monitor provides a way to shut down processes and apps that are resource-hungry. Click on the App name or process that you wish to stop, then click on the Force Quit button (it’s the small octagonal X icon in the upper left of the Activity Monitor window). However, it’s a much better idea to quit an app in the usual manner (Command-Q usually works) as Force Quit does not save work in progress.
Finding “Storage Hogs”
Activity Monitor doesn’t help as much when you try to find out what apps take up a lot of room on your disk. A better way to do this is to use About This Mac, found under the Apple ( ) menu. When About This Mac appears, click the Storage tab. The small bar chart that is shown for each drive mounted on the Mac isn’t too useful, but clicking the Manage… button displays storage usage by category.
For example, clicking on Applications in the left sidebar lists all of the apps on my iMac sorted by their storage requirements. As seen in the screenshot below, removing Adobe Lightroom Classic CC could save me 2.38 GB of storage. That’s not important on this iMac, but that could be very helpful to know on my MacBook Pro with much less available storage.
What Apps Are Crashing?
Sometimes it’s quite easy to figure out which apps are crashing, either on their own or by crashing the entire Mac: whenever you’re in that app, it crashes or locks up your Mac. Other times those apps might be running in background when they crash and you don’t know what happened. That’s where the Console utility, found in the Applications > Utilities folder, can come in handy. Console can also be launched from Spotlight with the Command-Space keyboard shortcut, typing Console, and then pressing Return.
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When Console is launched, click on User Reports in the sidebar on the left side of the app window. This provides a list of crash and diagnostic reports that quickly identify apps that are crashing often. The actual crash reports are fairly verbose and make no sense except to developers — who hopefully understand them and can use them to fix or troubleshoot an issue you report.(Console “User Reports” can help identify unstable apps.)
Removing Those Problematic Apps
If you’re having a problem with any app, whether with crashing, using too much energy, or taking up ridiculous amounts of storage, one good recommendation is to uninstall the app and then reinstall it. Uninstalling apps on a Mac is simple:
- Drag an app to the Trash from the Applications Folder
- Replicate the iOS “wiggle mode” by opening Launchpad (the rocket icon) from the Dock, clicking and holding on an app icon, and then clicking the X button next to the app icon
- For some apps that are stored in an app folder, there may be a separate uninstaller app available
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There’s a frustrating issue with macOS, where the app you’re using stops working and spits out an error message saying it isn’t open anymore. This mostly happens with Preview, but it can affect any app on your Mac, including Finder, Safari, the App Store, and others.
When this error occurs, the app you’re using becomes unresponsive and the following alert pops up:
Despite the error message, your app still appears as though it’s open. There may be a dot beneath it in the Dock or it may still have open windows. But you’re unable to use it. With Preview, that means you can’t open PDFs, screenshots, or other images anymore!
This article explains how to fix this error and get your apps working again. We’ve even gone so far as explaining how to fully reinstall macOS, in case this issue keeps cropping up again and again.
- 1 Quick Tips
- 2 Step 1. Force Quit Preview
- 3 Step 2. Reboot your Mac
- 4 Step 3. Remove your Preview preferences
- 5 Step 4. Update or reinstall macOS
Here are the basic steps to fix Preview when macOS tells you it’s not open anymore, we’ve explained each step more fully in the article below:
- Force Quit Preview using command+option+escape.
- Reboot your Mac, using a hard reboot if necessary.
- Remove your Preview preferences from the Library.
- Update and then reinstall macOS using Recovery Mode.
Step 1. Force Quit Preview
The first thing to try and do — although it doesn’t always work for this error — is to close the unresponsive app. Despite the error message telling you Preview “is not open anymore,” it usually is. But it has frozen and needs to be reopened.
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There are two ways to Force Quit an app in macOS: using the Force Quit window or using Activity Monitor. If either of these methods works, make sure you reboot your Mac before opening Preview again.
How do I close Preview using the Force Quit window?
- Press the command+option+escape keys to open the Force Quit window.
- If the escape key on your Touch Bar is unresponsive, go to > Force Quit from the menu bar.
- Select Preview from the list of applications.
- Click Force Quit, then reboot your Mac.
How do I close Preview using Activity Monitor?
- Open the Activity Monitor application in one of these ways:
- Go to Finder > Applications > Utilities.
- Or go to Launchpad > Other.
- Select the CPU tab, then click ‘Process Name’ to sort the processes.
- Find and select Preview in the list of processes.
- Click the stop sign button in the top-left of Activity Monitor.
- Choose Force Quit, then reboot your Mac.
Step 2. Reboot your Mac
If it’s not possible to close Preview using Force Quit or Activity Monitor, you can close it by rebooting your Mac instead. This forces any apps that macOS says are not open to restart, bypassing the error message.
The safest way to reboot your Mac is using a soft reboot, but that may not be possible if the unresponsive app cannot close. If that’s the case, you have no choice but to use a hard reboot. We’ve explained both reboots below.
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How do I soft reboot my Mac?
- From the menu bar, go to > Shut Down.
- Uncheck the box to reopen windows when logging back in.
- Confirm you want to Shut Down.
- Wait at least 30 seconds for your Mac to power off.
- Briefly press the power button to turn your Mac on again.
How do I hard reboot my Mac?
- Performing a hard reboot may result in lost data or corrupt files. If possible, save your documents and back up your Mac first.
- Press and hold the power button for 10 seconds or so until the screen goes black.
- Wait 30 seconds, then briefly press the power button again to restart your Mac
- In the alert window that appears, click Cancel to avoid reopening any apps.
Step 3. Remove your Preview preferences
If you still get the same error message — ‘The application “Preview.app” is not open anymore’ — you may need to remove some of your preference files.
These are small files that macOS automatically creates to store your settings for each application. You can usually remove them without losing any data or causing problems, but we recommend you back up your Mac first just in case.
Follow each of the suggestions below, testing Preview again after each one.
We advise you to move the preference files to a new folder on your Desktop for safekeeping, that way you can always put them back if something goes wrong. If this works and your issue is fixed, go ahead and delete those preference files.
How do I remove my Preview preferences?
- Open Finder, then from the menu bar select Go > Go to Folder.
- Type the following location and click Go:
- Move the highlighted preferences file to your Desktop for safekeeping.
- Reboot your Mac and test Preview again.
- If the error persists, repeat the steps above for each of the following files:
- ~/Library/Saved Application State/com.apple.Preview.savedState
Step 4. Update or reinstall macOS
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Hopefully, that’s all you need to resolve the ‘“Preview.app” is not open anymore’ errors. But if you’re still experiencing problems, there might be a bug in your operating software. You can fix this by updating or reinstalling macOS.
We suggest you update your Mac to the latest version of macOS first. Apple frequently releases patch updates to fix bugs like this, but you can’t benefit from them if you don’t keep your machine up-to-date.
If you’re already running the latest version of macOS or if an update doesn’t solve anything, you need to reinstall macOS using Recovery Mode. This shouldn’t affect your data — although we recommend you back up your Mac first anyway.
Reinstalling macOS rewrites every line of code in the operating software on your Mac.
How do I update to the latest release of macOS?
- Connect your Mac to a working Internet connection.
- Go to System Preferences > Software Update to check for new updates.
- Download and install any updates your Mac finds.
How do I reinstall macOS?
- If you haven’t already, make a new backup using Time Machine.
- Use the following instructions to boot your Mac into Recovery Mode:
- Go to > Shut Down and confirm you want to Shut Down you Mac.
- Wait 30 seconds for your Mac to fully power off.
- Briefly press the power button, then immediately hold command+R.
- When the Recovery Mode screen appears, click Reinstall macOS.
- Follow the on-screen prompts to complete the macOS reinstallation.
An App Isn't Showing Up In Activity Monitor On Mac Computer
Fingers cross, that’s the last of the ‘“Preview.app” is not open anymore’ messages. Check out this post if you need more help with crashing apps on your Mac.
And let us know in the comments if you found these suggestions helpful!
Dan is a freelance writer based in South West England.
He spent two years supervising repairs as a Genius Admin for Apple Retail and uses that knowledge to keep our troubleshooting guides up to date.
Long before that, Dan turned to Apple products from a musical background. Having owned iPods for years, he bought a MacBook to learn sound recording and production. It was using those skills that he gained a first-class Bachelor of Science in Sound Technology.