If you try to start up your Mac from a hard disk, network volume, or Time Machine backup that contains an incompatible version or build of macOS, you might experience one or more of these symptoms:
Your Mac doesn't finish starting up, or displays a prohibitory symbol at startup.
You see a message that you're using an unsupported or incorrect version of the Mac operating system.
Your Mac doesn't respond to your trackpad, mouse, or keyboard.
Apps unexpectedly quit.
Your Mac doesn't sleep or wake.
You don't hear any sound from your Mac.
The fans in your Mac are louder, because they're spinning faster.
The image on your display appears to shrink, has black bars around it, or appears tinted.
You can't use Bluetooth or Wi-Fi.
MacBook Pro, OS X Yosemite (10.10.5), Early 2011 Posted on Jan 6, 2016 8:45 AM Reply I have this question too ( 356 ) I have this question too Me too (356) Me too. In the past year, though, it’s become clear that Apple no longer believes in that approach, if it ever truly did. IOS 7 and 8 have taken big, bold steps in one direction—and OS X Yosemite has. Origin of the Place Name Yosemite. The following article explains of the meaning of the word Yosemite in more detail. It is from “Yosemite and Tamalpais,” Names (Journal of the American Name Society) 3(3):185-186 (Sept. Madison Scott Beeler, Professor of Linguistics, University of California Berkeley (1910-1989). Yosemite 10 / 2014 – OS X 10.10. The biggest design change in years, Mac OS 10.10 follows its little brother iOS - with a flatter appearance and blurred transparency effects. With the new Handoff functionality, users are able to move seamlessly between devices, even during individual tasks.
Jul 01, 2020 Rumors out of Apple's supply chain suggest Apple is working on a 23-inch iMac that's set to launch in the second half of 2020, so it looks like the. Sep 28, 2016 I've been on Yosemite 10.10.5 (on a mid 2009 Macbook Pro) almost since it came out and it's been stable as all get-out. Mavericks seemed a bit slow to me, but that was before a substantial RAM upgrade.
Which Mac operating systems are compatible?
The version of macOS that came with your Mac is the earliest version compatible with that Mac. To find out whether your Mac is compatible with a later version of macOS, check the system requirements:
If your Mac won't start up from a compatible version of macOS, it might require a specific build of that version. To get the correct build, reinstall macOS or upgrade to a later version of macOS.
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To restore a Time Machine backup that was created on a different Mac, use Migration Assistant.
Check compatibility
You can upgrade to OS Yosemite on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8GB of available storage space.
MacBook introduced in 2009 or later, plus MacBook (13-inch, Aluminum, Late 2008) MacBook Air introduced in late 2008 or later MacBook Pro introduced in mid 2007 or later Mac mini introduced in early 2009 or later iMac introduced in mid 2007 or later Mac Pro introduced in early 2008 or later Xserve models introduced in early 2009
To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with OS X Yosemite, the installer will let you know.
Make a backup
Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
Get connected
It takes time to download and install OS X, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.
Download OS X Yosemite
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS.
If you still need OS X Yosemite, use this link: Download OS X Yosemite. A file named InstallMacOSX.dmg will download to your Mac.
Install the macOS installer
Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallMacOSX.pkg.
Follow the onscreen instructions, which will guide you through the steps necessary to install.
Begin installation
After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install OS X Yosemite.
Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
Allow installation to complete
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both OS X and related updates to your Mac firmware.
Learn more
When Did Yosemite Come Out
OS X Yosemite won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.