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:
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VMware has been in the virtual machine game since 1998 and offers three different. The 'classic' Mac OS is the original Macintosh operating system that was introduced in 1984 alongside the first Macintosh and remained in primary use on Macs until the introduction of Mac OS X in 2001. Apple released the original Macintosh on January 24, 1984; its early system software was partially based on the Lisa OS and the Xerox PARC Alto computer, which former Apple CEO Steve Jobs. Reinstall Mac Operating System From The Recovery Partition. Turn on the Mac and immediately press and hold down both the Command key and the R key. Once you see the Apple logo appear in the middle of the screen you can release the Command and R keys. When the Mac has completed its startup, you should see a window similar this one. Linux, FreeBSD, and More. RELATED: What Is a Linux Distro, and How Are They Different from One.
- 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?
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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.