![]() 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.Information stored in NVRAM / PRAM includes: 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. If you are noticing issues with the speaker volume on your MacBook Pro, you may need to reset the NVRAM:
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