![]() The image on your display appears to shrink, has black bars around it, or appears tinted. ![]() The fans in your Mac are louder, because they're spinning faster.You don't hear any sound from your Mac.Your Mac doesn't respond to your trackpad, mouse, or keyboard.You see a message that you're using an unsupported or incorrect version of the Mac operating system.Your Mac doesn't finish starting up, or displays a prohibitory symbol at startup.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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