Reinstall Mac OX S, when prompt to select disk for installation, there is no disk. Neither Disk Utility showing the drive. I have got my one fixed Select and make sure it is in Mac OS Extended (Journaled) format. Select Apply.
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- Command R not working! How to reinstall MacOS if Recovery won't work
- Mac Installation Errors You Encounter and How to Fix Them
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We'll look at what to do if you fit into this category later in this article. First you should check that your Mac definitely hasn't got a working Recovery partition. It's possbile that you have been using the wrong key combination, or that your keyboard wasn't working, for example. If your Mac does boot into MacOS then you can at least check Terminal to see if you have a recovery partition, here's how to do that:.
You should see a list of all the volumes and partitions on your computer. Try using the Command-R process again. Okay, so either your Recovery Partition is missing, or doesn't work and you've tried everything.
Command R not working! How to reinstall MacOS if Recovery won't work
So it's time to look at reinstalling macOS without it. First, if it's an option here, you should take time to back up up your Mac using Time Machine. This will enable you to restore all your files, folders and apps once you've reinstalled macOS. The first approach is to use a feature called Internet Recovery. Newer Macs are able to boot directly from an internet connection, even with no Recovery partition available.
There are issues with Internet Recovery. In these cases it's usually best to find another network rather than create a USB Recovery Stick our next step. If you have Internet Recovery, then make use of it to reinstall macOS if possible.
Mac Installation Errors You Encounter and How to Fix Them
If you can't access Internet Recovery, then you are left with the option to create a bootable installer from a flash drive at least 12GB in size. Note that this completely erases the USB flash drive, so be careful to remove any files from it first. We cover how to create a bootable installer for macOS here , but we'll give an overview of the method below. The simplest way to create a USB flash installer it to use Terminal :.
In the case of Sierra or High Sierra you''ll see: something like this, for example. If you don't have the files, you may be able to get them by opening the Mac App Store, looking under your Purchased tab, and clicking to download the installer Although, if you are running Mojave this won't be an option, and if you are running High Sierra you won't find Sierra this way When you have got hold of the installer for the version of macOS that you require, follow these steps:. MacOS will now be installed on your hard drive from the bootable installer. The whole process can take around half an hour.
After this has finished you will have a new installation of macOS along with a Recovery partition. 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. 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. 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.
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- macos - OS X Mountain Lion - Cannot Select Disk to Install on when using VirtualBox - Super User.
- Use any of these 3 methods to get your Mac up and running.
- Command R Not Working! How To Reinstall MacOS If Recovery Won't Work - Macworld UK.
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. 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. Luckily, there's quite an easy fix. Then, open it back up, and the keyboard should begin working again. Hopefully Apple releases a fix for this bug soon — but at least it's relatively easy to get around for now. From there, you should see a file called 'com. Select and delete the file or move it to another folder for safe keeping , then restart your Mac and try connecting your Bluetooth device again.
Hold the keys down until the computer restarts and you hear the startup chime for the second time. Release the keys after you hear the second startup chime. The PRAM will be reset as well. Some people have found that Finder has been crashing or becoming unresponsive after updating to macOS Catalina. Press Enter. You will see a highlighted in Finder.
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Select the file, then delete it. Next, restart the Mac. One of the most controversial changes included with macOS Catalina is the fact that it no longer supports bit apps.