Press the power button and straight away press and. Look for a drive with a name like 'startup disk. To do this, turn up the volume to the maximum, then power off your Mac. The name varies by Mac but it will appear in the left panel. This screen appears after the computer shuts down and begins to restart. Thank you for using Apple Support Communities. Press Command + R on the slate gray screen. You can take your Mac to a Mac Genius or Apple Authorized Service Provider to replace the battery on the logic board. The logic board battery helps retain NVRAM/PRAM settings when your computer is shut down. If issues persist, your Mac's logic board battery (not a portable Mac's rechargeable battery) may need to be replaced. Hold the keys down until the computer restarts and you hear the startup sound for the second time.Īfter resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information.Press and hold the Command-Option-P-R keys before the gray screen appears.You will need to hold these keys down simultaneously in step 4. Locate the following keys on the keyboard: Command (⌘), Option, P, and R.You can use these steps to reset your NVRAM: For example, if your Mac starts up from a startup disk other than the one you've specified in Startup Disk preferences, or if a "question mark" icon appears briefly when your Mac starts up, resetting NVRAM / PRAM may help. If you experience issues related to these functions, you may need to reset the NVRAM or PRAM. Recent kernel panic information, if any.Step 2 Release both keys once you see the Apple logo appear in the middle of the screen, and your Mac will enter into Recovery Mode or spinning globe. Information stored in NVRAM / PRAM includes: On turning it on, press and hold down both the Command key and R key, which will direct your computer to start up from the Recovery Partition. On Intel-based Macs, this is stored in memory known as NVRAM on PowerPC-based Macs, this is stored in memory known as PRAM. Your Mac stores certain settings in a special memory area even if it is turned off. Volume Reset is a menu bar utility that sets your Macs volume to a predetermined level when you shut down or sleep your Mac. If you are noticing issues with the speaker volume on your MacBook Pro, you may need to reset the NVRAM:
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