Mac OS X Lion (version 10.7; marketed as OS X Lion) is the eighth and current major release of Mac OS X, Apple's desktop and server operating system for Macintosh computers.
A preview of Lion was publicly unveiled at Apple's 'Back to the Mac' event on October 20, 2010. It brings many developments made in Apple's iOS, such as an easily navigable display of installed applications, to the Mac, and includes support for the Mac App Store. On February 24, 2011, the first developer's preview of Lion was released to subscribers of Apple's developers program. Other developer previews were subsequently released, with Lion Preview 4 being released at WWDC 2011.
Lion achieved golden master status on July 1, 2011, followed by its final release via the Mac App Store on July 20, 2011. Apple reported over 1 million Lion sales on the first day of its release. As of October 2011, Mac OS X Lion has sold over 6 million copies worldwide.
Like PC, Mac also needs regular cleanup. The purpose of course is to make our Mac work smoothly and efficiently. Windows users have it very easy because they have Ccleaner. For those who are very familiar of Ccleaner, it's a free utility software that clears all unnecessary junk files to free up hard disk space, especially cache files or temporary internet files. These types of files literally take over your disk space so they need to be disposed, and that is what Ccleaner is for. Luckily, Mac users can use free Mac cleaner - EaseUS CleanGenius to clean your Mac junk files and free up disk space to boost the Mac's speed and improve its system performance.
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Mac cleaner software - EaseUS CleanGenius
EaseUS CleanGenius is a free Mac cleaner software for Mac OS X 10.7 and later. All types of Mac machine are supported like Mac Mini, Macbook Air, Macbook Pro, iMac, Mac Pro. It provides the following features:
Fast clean: EaseUS CleanGenius offers an easy way to clean the system caches, system logs, user logs, user caches, system junk files, user downloads folder, trash, Safari internet cache and more just by one click. It thus offers an easy way to keep your Mac clean and healthy and lets it run smoother and faster.
App uninstall: EaseUS CleanGenius also offers applications uninstall. When you drag an application to the Trash, its preferences, cache and log files still remain on your drive and waste valuable disk space. With EaseUS CleanGenius, you can completely remove applications and their associated files.
Disk space monitor: Show disk space and warn you when disk space is running low so that you can clean your Mac in time to free up more dissk space.
Disk ejector: Safely eject your mounted drives, such as external storage disks, CD and DVD disks, SuperDrive, network storage, disk images.
Browser Plug-ins Cleanup: Support to clean up and remove browsers such as Safari, Chrome or Firefox plug-ins, cache and cookies. Your browsing histories, bookmarks and downloaded files won't be cleaned.
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.
Create a backup
Make sure that you have a current backup of your important files. Learn how to back up your Mac.
Sign out of iTunes in macOS Mojave or earlier
If you're using macOS Mojave or earlier, open iTunes. From the menu bar at the top of the screen or iTunes window, choose Account > Authorizations > Deauthorize This Computer. Then enter your Apple ID and password and click Deauthorize.
Learn more about deauthorizing computers used with your iTunes account.
Sign out of iCloud
If you're using macOS Catalina or later, choose Apple menu > System Preferences, then click Apple ID. Select Overview in the sidebar, then click Sign Out.
If you're using macOS Mojave or earlier, choose Apple menu > System Preferences, click iCloud, then click Sign Out.
You will be asked whether to keep a copy of your iCloud data on this Mac. You can click Keep a Copy, because you're erasing your Mac later. Your iCloud data remains in iCloud and on any other devices that are signed in to iCloud with your Apple ID.
Sign out of iMessage
If you're using OS X Mountain Lion or later, open the Messages app, then choose Messages > Preferences from the menu bar. Click iMessage, then click Sign Out.
Reset NVRAM
Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. Release the keys after about 20 seconds. This clears user settings from memory and restores certain security features that might have been altered.
Learn more about resetting NVRAM or PRAM.
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Optional: Unpair Bluetooth devices that you’re keeping
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If your Mac is paired with a Bluetooth keyboard, mouse, trackpad, or other Bluetooth device that you plan to keep, you can unpair it. This optional step prevents accidental input when the Mac and device have separate owners but remain in Bluetooth range of each other.
If you're unpairing Bluetooth input devices from a desktop computer such as an iMac, Mac mini, or Mac Pro, you must plug in a USB keyboard and mouse to complete the remaining steps in this article.
To unpair a Bluetooth device, choose Apple menu > System Preferences, then click Bluetooth. Move your pointer over the device that you want to unpair, then click the remove (x) button next to the device name.
Erase your hard drive and reinstall macOS
The best way to restore your Mac to factory settings is to erase your hard drive and reinstall macOS.
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After macOS installation is complete, the Mac restarts to a setup assistant that asks you to choose a country or region. To leave the Mac in an out-of-box state, don't continue setup. Instead, press Command-Q to shut down the Mac. When the new owner turns on the Mac, the setup assistant guides them through the setup process.
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No matter the model or condition, we can turn your device into something good for you and good for the planet: Learn how to trade in or recycle your Mac with Apple Trade In.