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:

• Os X El Capitan
• Os X 10.12

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• 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.

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: Ccleaner for mac os x lion.

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.

Learn more

• To restore a Time Machine backup that was created on a different Mac, use Migration Assistant.

Q&A

Os X El Capitan

Os X 10.12

• Doesn't native Mac software uninstall third-party apps?
  It does, but it leaves some junk files that could have been wiped better. That's why the entire class of uninstallers exists.
• If I use uninstall software from Mac with a program uninstaller, won't it damage other applications or files?
  It shouldn't. It removes files according to the system records that list all the necessary ones - and nothing else.
• Can I uninstall system apps with it?
  No, this feature is blocked by Apple. You'll have to live with Mail, despite using web interface, with Photos app even if you prefer a third-party viewer, and with App Store even if you only buy apps from developers directly. That's because of high software integration within OS X.
• Are these apps worth purchasing?
  With such an app, you can work, for example, with your 128GB MacBook almost as efficiently as if it was a 256GB model. And the price of these two differs. You can even save a bit if you purchase a model with less storage but keep it in order.