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edited May 18, 2018 at 6:37

Older Macs had what's called Parameter RAM (PRAM), newer Macs use Non Volatile Random Access Memory (NVRAM). ItIt may be worth you also resetting thisyour NVRAM.

Resetting the NVRAM

Here’s how to reset the NVRAM on your MBP:

1. Shut down your machine. Yes, a full shutdown, not just logging out.

2. Press the power button and then press the commandoptionPR keys. You have to make sure you press these keys before the gray screen appears or it won’t work.

3. Hold those keys down until your Mac reboots again (i.e. a 2nd time) and you’ve heard the startup chime twice.

4. Let go of the keys and let your MBP reboot normally.

Shut down your machine. Yes, a full shutdown, not just logging out.

Press the power button and then press the command option P R keys. You have to make sure you press these keys before the gray screen appears or it won’t work.

Hold those keys down until your Mac reboots again (i.e. a 2nd time) and you’ve heard the startup chime twice.

Let go of the keys and let your MBP reboot normally.

Note: When you log back in you may need to readjust some of some of your system preferences (e.g. speaker volume, screen resolution screen resolution, startup disk selection, time zone information, etc). As a minimum I would check your Startup Disk settings.

Older Macs had what's called Parameter RAM (PRAM), newer Macs use Non Volatile Random Access Memory (NVRAM). It may be worth you also resetting this.

Resetting the NVRAM

Here’s how to reset the NVRAM on your MBP:

1. Shut down your machine. Yes, a full shutdown, not just logging out.

2. Press the power button and then press the commandoptionPR keys. You have to make sure you press these keys before the gray screen appears or it won’t work.

3. Hold those keys down until your Mac reboots again (i.e. a 2nd time) and you’ve heard the startup chime twice.

4. Let go of the keys and let your MBP reboot normally.

Note: When you log back in you may need to readjust some of your system preferences (e.g. speaker volume, screen resolution, startup disk selection, time zone information, etc).

It may be worth you resetting your NVRAM.

Resetting the NVRAM

Here’s how to reset the NVRAM on your MBP:

Shut down your machine. Yes, a full shutdown, not just logging out.

Press the power button and then press the command option P R keys. You have to make sure you press these keys before the gray screen appears or it won’t work.

Hold those keys down until your Mac reboots again (i.e. a 2nd time) and you’ve heard the startup chime twice.

Let go of the keys and let your MBP reboot normally.

Note: When you log back in you may need to readjust some of your system preferences (e.g. speaker volume, screen resolution, startup disk selection, time zone information, etc). As a minimum I would check your Startup Disk settings.

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created May 18, 2018 at 6:12

Monomeeth ♦

Older Macs had what's called Parameter RAM (PRAM), newer Macs use Non Volatile Random Access Memory (NVRAM). It may be worth you also resetting this.

Resetting the NVRAM

Here’s how to reset the NVRAM on your MBP:

1. Shut down your machine. Yes, a full shutdown, not just logging out.

2. Press the power button and then press the commandoptionPR keys. You have to make sure you press these keys before the gray screen appears or it won’t work.

3. Hold those keys down until your Mac reboots again (i.e. a 2nd time) and you’ve heard the startup chime twice.

4. Let go of the keys and let your MBP reboot normally.

Note: When you log back in you may need to readjust some of your system preferences (e.g. speaker volume, screen resolution, startup disk selection, time zone information, etc).