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- How to Change Your Mac's Startup Disk.
You can also restart you computer in Target Disk Mode, which allows you to connect to another computer using a FireWire cable and use it as a hard disk. To restart your computer, click Restart. Hold down the Option key while you restart your computer, select a startup disk, and then click Restart.
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How to Change Your Mac's Startup Disk | Macinstruct
See All Related Store Items. Timesaver Hold down the Option key while you restart your computer, select a startup disk, and then click Restart. If this is the case, you'll need to force a reboot of your Mac or MacBook. Don't worry, the 'Setting Up Your Mac' message means the update is finished, so you won't lose any data or damage anything by restarting your Mac. To do so, press and hold down the power button for a few seconds until the Mac or MacBook turns off. Wait a few more seconds, then turn it back on. If you're having trouble logging into your Mac or MacBook after installing macOS Catalina, or you're stuck in a loop where you log in, then get logged out again, the following steps might help.
This removes a file, which makes it appear like you're starting Catalina up for the first time. Don't worry, nothing important is getting deleted. Press Enter, then restart your Mac. Some readers have got in contact to let us know that they are experiencing problems with the Mail app in macOS Catalina.
If you use Mail to read and send emails, and it's not working correctly after installing macOS Catalina, read on to find out how you can fix the most common issues. If Mail keeps crashing while you use it, open up Finder and then click on 'Go' from the top menu and select 'Go to Folder'.
Find com. MailServiceAgent and move them, either to Trash or somewhere temporary like your desktop. Empty Trash, then restart your Mac and see if that works. There are reports that the search function no longer works in the Mail app after installing macOS Catalina.
The first thing to try, if you encounter this problem, is first close Mail completely. Then hold Shift and click on the Mail icon to open it in Safe Mode. Then, close Mail again, then hold Shift and open Mail again. Finally, close Mail yet again, then reboot your Mac. Open Mail normally, and search should work again.
Choose the Default Startup Volume in Mac OS
Reboot the Mac and load up Mail to see if search works. Once macOS Catalina is installed on your Mac or MacBook, you may notice that your device is running slower than before.
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If macOS Catalina also showed a notification that said "Optimizing Your Mac: Performance and battery life may be affected until completed," then this is normal, as macOS Catalina is doing things behind the scenes which can initially impact performance. After a day or so, your Mac should be running just as well if not better as before. If you don't see an improvement by then, try restarting your Mac or MacBook. Another thing to check is to make sure that all of your apps and software are updated to the latest version. If any of them have issues with Catalina, that could be slowing down your machine.
You can also open up the Apple menu and select 'System Preferences'. Select 'Login Items' and then select the apps you want to stop opening at startup and click the small minus sign below the list. It's also worth making sure all of your apps are updated. Check the App Store for any available updates, or the app's website. You can also try restarting your Mac to see if that helps.
If it doesn't, force-quit any apps that appear to be taking up a lot of RAM. Its CPU tab lists active processes, with a real-time view of what's going on. To force-quit an item, click it in the Activity Monitor list, click the X at the left of the toolbar, then confirm you want to force-quit. Also delete the cache.
How to Change Your Mac's Startup Disk
Open the Finder window, select 'Go' from the top menu and select 'Go to Folder'. Remove the data from inside every folder. As with the performance issues above, you may find that at first your MacBook's battery life is a lot shorter. Again, this is probably because macOS Catalina is doing some background work to set itself up — and after a few hours or a day, things should have settled down and your battery life should be back to normal. If it isn't then make sure all your apps are updated. You can also click the battery icon on the top menu bar, which will show you what apps and processes are taking up a lot of your battery life.
Close those and see if the battery improves. If it does, then make sure the apps in question have been updated, and check any of their settings to see why they would be taking up so much battery life in macOS Catalina. For more advice, visit our how to improve your MacBook's battery guide.
Here's an odd one. Some people have been complaining that after updating to macOS Catalina, the keyboards of their MacBooks no longer work.
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