This clears user settings from memory and restores certain security features that might have been altered. Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. If you're using OS X Mountain Lion or later, open the Messages app, then choose Messages > Preferences from the menu bar. Your iCloud data remains in iCloud and on any other devices that are signed in to iCloud with your Apple ID. You can click Keep a Copy, because you're erasing your Mac later. You will be asked whether to keep a copy of your iCloud data on this Mac.

If you're using macOS Mojave or earlier, choose Apple menu  > System Preferences, click iCloud, then click Sign Out. Select Overview in the sidebar, then click Sign Out. If you're using macOS Catalina or later, choose Apple menu  > System Preferences, then click Apple ID. Learn more about deauthorizing computers used with your iTunes account. Then enter your Apple ID and password and click Deauthorize. From the menu bar at the top of the screen or iTunes window, choose Account > Authorizations > Deauthorize This Computer. If you're using macOS Mojave or earlier, open iTunes. Sign out of iTunes in macOS Mojave or earlier Make sure that you have a current backup of your important files. Portions of EMMA data provided by Standard & Poor's Securities Evaluations, Inc., CUSIP Global Services & American Bankers Association.

EMMA is a service of the Municipal Securities Rulemaking Board, which protects investors, state and local governments, and the public interest. Marathon broke new ground in the first-person shooter genre across all platforms, which is quite an achievement as it was only available for Mac OS. You can't call yourself a Mac gamer without having played this. One of the all-time great first-person shooters for the Mac is still available, and it's available for free. Moving to a new Mac? Before taking these steps, you can use Migration Assistant to move your files from the old Mac to your new Mac.

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