All Macs have a built-in app called Preview that opens when you view images or a PDF file. As its name suggests, it works by generating a preview of a selected image or a PDF file, allowing you to save time from opening the wrong files.
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What makes this app even more useful is that it has many other features, allowing you to edit a clipboard image, fill out documents, sign files, remove an image background, edit photos, and remove PDF pages.
Now, with all its advanced features, you may think that Preview works seamlessly. But some Mac users have reported experiencing issues with it. While some are unable to modify PDFs in Preview, others have found that the app is not working on their Macs.
If you suspect that you are experiencing a Preview glitch while modifying PDFs or documents in macOS Mojave, then try the fixes we have compiled for you below.
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that can cause system issues or slow performance.
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How to Fix Preview on Mac Mojave
Here are some fixes to your Preview problems on Mac:
Fix #1: Reset the SMC.
The System Management Controller (SMC) plays a vital role on your Mac. Aside from controlling power management aspects like hibernation, along with sleep and wake features, it also performs constant checks to ensure your Mac is running on authentic Apple hardware.
If there is a problem with the SMC, it is likely that the actively running apps on your Mac will suffer. The Preview app is no exemption.
To reset the SMC of your Mac, follow the steps below: Cathode ray sunshine mac os.
For Macs with a non-removable battery
- Click on the Apple menu.
- Select Shut Down.
- Once your Mac has completely shut down, hold the Shift + CTRL + Option keys and the Power button for 10 seconds.
- Release the keys together.
- Switch on your Mac by pressing the Power button again.
For Macs with a removable battery
- Switch off your Mac.
- Remove its battery.
- Hold the Power button for 10 seconds.
- Put back the battery.
- Hold the Power button again to switch on your Mac.
Fix #2: Reboot Your Mac in Safe Mode.
Rebooting your Mac in Safe Mode can help resolve problems associated with the startup disk or built-in apps. Mac experts even recommend that it should be the first step to take if you encounter problems.
To reboot your Mac in Safe Mode, follow these steps:
- Switch off your Mac.
- Hold the Power button and Shift key together. Release them when you see the Apple logo.
- If your Mac is encrypted with FileVault, you might be prompted to log in twice.
- At this point, you have already rebooted your Mac in Safe Mode. Try opening any PDF file or image using Preview. See if it works. If the issue persists, try the next fix.
Fix #3: Try Using Preview on Another User Account.
To find out if the problem is only isolated to your account or system-wide, use another user account. It can be an existing user account or a new one. But for better results, use a newly created account.
To create a new user account, follow these steps:
- Go to the Apple menu.
- Select System Preferences.
- Navigate to Users & Groups.
- Click the Lock button and enter your administrator username and password.
- Hit the Add button.
- Fill in the information needed to create a new account. Click Create Account.
Once you have another user account, log onto it to test Preview. Darklin wars (demo) mac os. Make sure the PDF file or image you want to preview is available to that account. To do that, drag the file to the Shared folder under the Users folder.
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After making the file available to the new account, log out of your current account and log in with your newly created account. Next, follow the steps below:
- Click on the Apple menu.
- Select Log out.
- You will be taken to the login window. Enter the login credentials of the new account you created.
- Once logged in, try to open the PDF file or image. If the Preview glitch does not pop up, then it is likely that the problem is with your Mac user account.
Fix #4: Scan Your System.
Cache files created by apps, unnecessary log files, diagnostic reports, and trash may have built up on your Mac over time and consumed valuable space. As a result, the performance of installed apps may be affected. Sometimes, they run slow. Errors and glitches also do happen.
To avoid this, scan your system and get rid of those unwanted files. You can do it manually by going folder to folder. You can also use a third-party Mac cleaning tool to save time and not miss anything.
Fix #5: Relaunch Finder.
If the thumbnails of images on Preview don't show up, then you can try relaunching Finder. Follow the steps below:
- Open the Preferences folder.
- Go to Home and select Library.
- Choose Preferences.
- Delete the com.apple.finder.plist file.
- Right-click on the Finder icon.
- Select Relaunch.
Summary
Hopefully, this guide helps you resolve the glitch you are experiencing with the Preview app. If none of the fixes helped, you can use another built-in macOS app to open PDFs and images: Grab. You can also downloadother similar apps from the Apple Store.
Let us know how your troubleshooting experience went. Share it with us below!
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About unexpected restarts
Rarely, your Mac might experience a software or hardware issue that requires it to restart. When it starts up again, you might see a message that your computer was restarted because of a problem.
Unexpected restarts are usually caused by software installed on your Mac, or by devices connected to your Mac. If the issue causes your Mac to restart every time it attempts to start up, your Mac might eventually shut down. Use the steps below to check the software and hardware on your Mac.
Check your software
If the issue is caused by software on your Mac, one of these steps might help:
- Install all available software updates.
- If your Mac suspects that a particular app caused the restart, it might ask whether you would like to move the app to the Trash. Click Move to Trash, then contact the software developer to see if a software update is available.
- Use safe mode to try to isolate the cause of the issue.
- Reinstall macOS. If the issue continues after reinstalling macOS, check your hardware.
Check your hardware
Learn how to check your connected devices and other hardware.
Check peripheral devices first
If you don't have any devices attached to your Mac, skip to the next section.
- Shut down your Mac.
- Disconnect all peripheral devices, such as hard drives or printers. If you have a desktop Mac, make sure that only a display, keyboard, and mouse or trackpad are connected.
- Turn on your Mac.
- Use your Mac for the amount of time that it would usually take for an unexpected restart to occur.
- If an unexpected restart occurs, follow the steps to check the internal RAM and third-party hardware.
- If an unexpected restart doesn't occur, turn off the Mac and connect one peripheral device at a time until an unexpected restart occurs.
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Check RAM and third-party hardware
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Certain models of Mac computers have removable memory (RAM). If you recently installed memory or a hard disk (or SSD), make sure that it's compatible and installed correctly. If possible, remove it and test with the original memory or disk.
Learn more
- If you continue to experience unexpected restarts, contact Apple Support.
- If your Mac is frequently restarting unexpectedly, it's important to determine the exact steps that lead up to the issue. The next time that your Mac restarts unexpectedly, record the date and time it occurs. These questions might help you diagnose the problem:
- Was the computer starting up, shutting down, or performing a particular task when the unexpected restart happened?
- Is the computer restart random, or does it happen every time you do a certain task?
- Does the restart happen when a specific external device is connected to your Mac or to a specific port?
- Learn what to do if your Mac doesn't turn on or start up.
- Learn about the screens you see when your Mac starts up.
