Reset pram on mac lion

Home Questions Tags Users Unanswered. Ask Question. Any ideas? Alex Plumb Alex Plumb 1, 3 3 gold badges 12 12 silver badges 16 16 bronze badges. Mountain Lion does not have this functionality, but Mavericks does! Resetting the PRAM is now as simple as running the following command as root: nvram -c According to the man page for the nvram command in Mavericks : -c Delete all of the firmware variables.

I should note that this also works all the way up to and including Sierra. You have to be logged-in as an administrator. You must use "sudo" before the "nvram" command if you do this in the terminal. RockPaperLizard 3, 13 13 gold badges 38 38 silver badges 76 76 bronze badges.

Thomas Thaler Thomas Thaler 1. Turn on the power, then hold these keys down. Ensure that the keys are held down until the second boot sound plays. Release the keys.

How to reset your Mac's NVRAM, PRAM, and SMC

JakeGould 34k 10 10 gold badges silver badges bronze badges. James Dietz James Dietz 10 2 2 bronze badges. The user wants to write a script to automate this from a shell in a running system, not doing it by rebooting. Thx a lot for this manual. I was running FileVault to save my files, but because I had wrong rights filevault terminates my Mac, so that it freezes and nothing more was working.

After a hard reset and after trying to reboot from the recovery it only came the internet recovery option. Nearly on the way to the Apple store. Could be that the hard drive is dead. I read your explanation of the smc reset. I tried, because it was my last chance. Done and rebooted into the recovery section with the harddiskrepair.

Checked the harddisk…seems okay, but the rights are wrong. Trying now to fix the issue and maybe then I will have the chance to unlock the data. I will see, because decrypted not really much. Maybe I have a chance. But without your help I will be now at the Apple store and bought me a new hard drive or ship it to the care center. Thx from Germany!!! You saved my day. I tried to just push them, I tried to hold them down for a little while… how do i understand that the SMC has indeed been reseted?

A beep? A light? Any sign at all? Im having the same problem. Im pretty sure my mac is not reseting the SMC because the energy setting had not reset. Is there anything else i can do? Well, I started getting these restart messages every time my computer did start working, and had to keep doing this until the computer just gets stuck at the white loading screen with a grey spinning wheel under an apple sign grey also, this computer has the rounded edges and no, does not have the removable battery.

If following these directions does not work, try powering down, unplugging, then doing the shift, control, option, power thing then restart. Thank you so much. MacBook 1,1 Intel Core Duo.

Your Answer

Apple is doing their best to deny replacing the ruined batteries but at some point the pressure from customers will make them face this issue, or litigation will. I have a macbook pro 17 inch running Yosemite for awhile everything ok. Replace the battery, reconnect power, and zap PRAM and wait for 2 chimes before letting the keys go. Check out more information on when and how to reset your SMC.

Gary, same here, did you ever figure out what was wrong? Could a bad hard drive cause this? Name required. Mail will not be published required. All Rights Reserved. Reproduction without explicit permission is prohibited. Shaun Sweeney says:. February 6, at am. MacBook Mike says:. January 28, at pm. Kevin says:. September 18, at pm. Pablo says:. September 19, at am. Mike O'Connor says:. August 11, at pm.

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What the SMC does

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How to Reset NVRAM on your Mac - Knowledgebase / Mac OSX - EOAS Help Desk

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