Apple also claims "your battery is designed to retain up to 80 percent of its original capacity at 1,000 complete charge cycles." That’s not 100 percent. Each cycle is measured when the machine uses all the battery’s power and then fully recharges it. Want to know why your MacBook can’t hold a charge the way it used to? Most modern models have a limited charge cycle of 1,000. That’s your green light to copy over everything from the external drive. Punch in your Apple account info (if necessary) and the computer will be automatically formatted to factory settings. Look for Internet Recovery/OS X Recovery and select Reinstall OS X.Choose Wi-Fi from the Utilities menu and connect to your router.Release them, and an alternative boot screen with a Mac OS X Utilities menu will appear to complete the system restore. Hold the Command and R keys simultaneously until the Apple logo appears.Shut down the machine and boot it back up with an AC adapter plugged in.Once you're backed up, follow these steps: We recommend the WD My Passport for Mac because it comes Time Machine-ready and in multiple storage options (1TB to 4GB). Start by backing up all your files - documents, music, etc. Restoring it back to its original state will give your Macbook that straight-out-of-the-box feel.
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