Перейти к основному содержанию

How to reset the SMC, PRAM and NVRAM on a Mac Laptop

  1. How to reset the SMC, PRAM and NVRAM on a Mac Laptop, SMC Reset for Mac Laptops with a Non-Removable Battery: шаг 1, изображение 1 из 1
    • If your Mac has a removable battery, skip this step and go to step 2.

    • Choose Apple menu > Shut Down.

    • After your Mac shuts down, press Shift-Control-Option on the left side of the built-in keyboard, then press the power button at the same time. Hold these keys and the power button for 10 seconds. If you have a MacBook Pro with Touch ID, the Touch ID button is also the power button.

    • Release all keys. Press the power button again to turn on your Mac.

  2. How to reset the SMC, PRAM and NVRAM on a Mac Laptop, SMC Reset on a Mac Laptop with a Removable Battery.: шаг 2, изображение 1 из 1
    • Power down your Mac.

    • Remove the battery.

    • If you are unsure how to remove your Mac's battery, head on over to this linkand select your Mac's make and model.

    • Once you have removed the battery, press and hold the power button for 5 seconds.

    • Release the power button. Reinstall the battery.

    • Press the power button again as you would to turn on the Mac.

  3. How to reset the SMC, PRAM and NVRAM on a Mac Laptop, PRAM/NVRAM Reset: шаг 3, изображение 1 из 1
    • Shut down the computer

    • Press the Power button

    • Before the grey color screen is shown, press and hold Command + Option + P + R keys simultaneously.

    • Hold down these keys until the MacBook restarts and then you will hear the startup sound.

    • Release the keys.

    • Once you have reset PRAM/NVRAM, keep in mind that settings like disk caches, volume, time, keyboard and mouse preferences, will also be reset.


If these reset did not help you with your Mac, head on over to the Answers Forum (if you have not already been there) and ask our friendly community for the next steps.

28 участников успешно повторили данное руководство.


Участник с: 08/28/18

26 355 Репутация

Автор 21 руководств

2 Комментариев

Got a 2012 Macbook Pro. Was running GIMP with a couple Browsers open and Word. Gimp crashed twice and I had to restart it. I saved a GIMP file to a png. Placing one png over another, it all froze: Cursor and all not moving. Pressed Cntrl/alt/shift, etc and it closed the the first application open, in layered fashion, but until I got to the last finder window, it kept opening. Shut down completely. Start up took about 2 minutes (usually 37 seconds. Has 2TB SSD and 10GB memory). Was super fast, until today).

When I click on any file or program, it hesitates for a second, then opens as if it’s on a delay, with an odd trace of lighting or movement tracks. Tried the finder “search” and it isnt’ recognizing anything, like it’s not accessing directories, etc. Had to open Applications, to get DiskUtility and run it. Nothing changed. There is a thin grey line that appears to run horizontally through the middle of the “search box”. What’s up???

Fish Outta Water - Ответить

I replaced the battery, as old battery was only holding a partial charge, but still worked After the battery replacement, it turned on a court of times and was charging, the next day nothing would power up

Thanks I. Advance fog your assistance

Colin. m Donald

colinmd55 - Ответить

Добавить комментарий

Просмотр статистики:

За последние 24часов: 139

За последние 7 дней: 915

За последние 30 дней: 4,424

За всё время: 188,467