Apple Issues? Try Clearing NVRAM / PRAM

Howdy all!

 

Apple computers tend to work pretty well with CloudReady once installed, but getting to that point can be tricky. A series of issues exist which you can search the forum for individually, but I wanted to offer a quick walk through for how to clear some stateful settings that can prevent good installation, booting after installation, or even proper boot speed.

 

Clearing Logicboard RAM

Apple computers have memory on their logic board to save settings like boot device, brightness, volume, etc. This used to be called PRAM on older machines, and on newer ones is called NVRAM.

In both cases, they behave similarly and can be cleared with the following steps:

 

NOTE: Neverware does NOT recommend resetting NVRAM on the iMac 5,2

 

1) Shut down computer entirely

2) Power up, and immediately hold down cmd+opt+p+r

3) Keep holding that key combo for a while - You'll need to keep holding it through an entire power cycle, from boot-tone to boot-tone. Don't let go!


Now you're done! You may need to reset brightness and volume and stuff, but boot time may be significantly improved and, in some specific scenarios, you might even be able to fix a total failure to boot.

 

Good luck!

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8 Comments

  • Avatar
    Quinten Adema

    At step 3, how much boots do you mean? When I keep holding the keys, it cycles..

  • Avatar
    Forrest Smith

    only 2 in total - you should hear the chime twice.

  • Avatar
    David B

    After successfully booting up my MacBook 2,1 from USB and installing, I was unable to boot up on my internal hard drive (started the process. Got past grub screen, then was grey/black screen and hung up). I used the PRAM reset and now when I press the power button I hear the laptop try to turn on but it doesn't have a chime and only stays a black screen with the front power light on. I can't even hold option to get to the startup disk screen. Any ideas how to fix that?

  • Avatar
    Forrest Smith

    Hey David,

    Better to open a separate thread to troubleshoot your specific situation.

    Start by seeing if you can still boot successfully from USB, as well as what happens if you use the option-boot and manually select the internal HDD.

  • Avatar
    David B

    I did try booting with the USB drive by holding option + D and just with it in. No luck. As soon as I hit the power button it makes a noise like it tries to start, but there is no chime and the screen remains black.

  • Avatar
    Rory Silva

    Same problem here.

  • Avatar
    Forrest Smith

    David and Rory -

    It is better if you open separate threads if you have an issue with your machine. These articles are meant to be as general as possible, and the comment should really pertain to the article and not anyone's specific situation.

    We'll be happy to help if you open a new thread and describe your issue in detail, including what you've tried so far to fix it.

  • Avatar
    David B

    Forest,

    After your initial suggestion, I did create a new thread specific to this issue (link below). https://neverware.zendesk.com/hc/en-us/community/posts/115000522707-Macbook-2-1-will-not-boot-after-PRAM-refresh

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