Announcement: Upgrade to macOS Mojave

With features like Dark Mode, Stacks, and four new built-in apps, macOS Mojave helps you get more out of every click. 
Find out how to upgrade to macOS Mojave > https://support.apple.com/macos/mojave

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Question: Whenever I start up my Mac there is a screen with a circle with a slash through it. I have tried to download Os Sierra but it says that my computers validity needs to be checked with Apple.What do I do?

I started up my MacBook one day and it had a circle with a slash.I have tried to install macOS Sierra but it says that my validity has to be checked. I can’t bring it in to an Apple store as I don’t have the money to get it fixed there.

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Question: Whenever I start up my Mac there is a screen with a circle with a slash through it. I have tried to download Os Sierra but it says that my computers validity needs to be checked with Apple.What do I do?