Apple Issues? Try Clearing NVRAM / PRAM




  • Quinten Adema

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

  • Forrest Smith

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

  • 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?

  • 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.

  • 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.

  • Rory Silva

    Same problem here.

  • 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.

  • David B


    After your initial suggestion, I did create a new thread specific to this issue (link below).

  • Lars Berglund

    After resetting NVRAM, the start up chime will be at full blast, 100 percent! On an iMac, that's really loud. So here's a top tip for you:

    After resetting NVRAM, boot into an existing Mac OS X start disk (start your Mac with option key held down and choose the Mac OS X). You have to do that because the nvram command in Terminal isn't available anywhere else.

    Launch Terminal and type:

    sudo nvram SystemAudioVolume=%80

    Press enter and then type your password (you won't see it on the screen). Hit enter again, done!

    It is important not to choose a start up disk after this command in Mac OS X, because then you will be in the same spot as before, regarding slow start up.

    Shut down the computer and then start it up normally. The sound should be much lower now, but the start up time should not be affected.

    I have tested this on my own iMac8,1, and it works.

  • jgay

    Is this reset NVRAM process for macs that are already running neverware?  If not, is there a way to do it with neverware running?  I don't get a chime at all and boot time seems to be slow (45 sec - 1 min) although no other problems.  Running neverware on mid/late 2007 imac with new SSD drive.

  • Forrest Smith



    You should be able to do this before or after installing CloudReady. I would expect the tone to not necessarily play the first time around, but if you hold the keys for a full minute or two, the volume should reset and become audible.

    Are you using an apple keyboard? I'm not certain what the right key combo would be on a non-apple keyboard - maybe that's the difference?

  • jgay

    Okay, that worked.  I had not previously heard any tone(s) on startup and when I reset the PRAM it made the tones just as described and now does so on each startup.  Didn't noticeably help the boot time but maybe I have unrealistic expectations.. it's 30 sec to login screen and then 5-10 seconds after typing in my password to move on to opening up tabs in chrome.

  • Forrest Smith

    jgay - 

    One or two things might be slowing down your machine more than you expect:

    1) Your SSD is bottlenecked by the connection inside the 2007 iMac. That's a 10-11 year old machine now, sow the connection probably can't keep up with the SSD.

    2) Your SSD might not be all that much faster than a 7200-rpm HDD. If it's lower quality SSD or actually eMMC etc it might only be a modest gain over an HDD.


    You can always re-try ctrl+clicking the boot device to ensure it's selected as your default, but you may be right that adjusting expectations is the key.  

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