Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [nvram]

Non-volatile random access memory; RAM that doesn't lose the stored information when the power is turned off, unlike traditional RAM

2
votes
2answers
5k views

Setting a NVRAM variable in normal boot not permitted but allowed in recovery mode

If memory serves me right then in Yosemite it was possible to set the NVRAM variable agc with nvram boot-args even in normal full boot mode. This seems to have changed in later versions of the OS. ...
11
votes
4answers
38k views

Trying to set boot-args with nvram gets “general error” on Sierra

I'm trying to temporarily disable KEX signing enforcement on my MBP since my company's VPN client (GlobalProtect) is failing the signature check now. This started yesterday when I did the OS upgrade ...
8
votes
1answer
13k views

How can I view/inspect my Mac’s Parameter RAM (NVRAM)?

Inspired by this question I started looking for apps that allow to read the data saved in my Mac’s Parameter RAM. Aside from a very antique (pre OS X) application for Classic, I could not find any. Is ...
3
votes
3answers
8k views

How can I reset the PRAM if Recovery Mode keeps overriding the PRAM command?

Lion uses the ⌘ + R to boot into recovery mode. Resetting the PRAM in anything less than 10.7 was ⌘ + ⌥ + P + R. Recovery mode now seems to override the PRAM command. Does anyone ...
1
vote
1answer
378 views

Reset PRAM in MacMini 3,1 (Early 2009) and now it won't boot at all, but powers on and chimes

I was having problems booting to Apple Hardware Test and decided to reset the PRAM. Big mistake; now it won't boot at all. It's a Mac Mini 3,1 (Early 2009) running El Capitan. PRAM reset chimed twice. ...
3
votes
2answers
1k views

On lid open Macbook Pro 2016 boots automatically - after turning off I need to juggle 10 seconds with the touch id power button to boot

I have the late 2015 (15 inch) MacBook Pro. By default it turns on when laptop lid is open. This is not good for me, sometimes I open the lid on weak battery to make sure it's not turned on, so I ...
2
votes
1answer
2k views

No boot-args in nvram

After seeing this question regarding the serverperfmode nvram boot-arg, I thought I would check my server to see its status: $ nvram boot-args nvram: Error getting variable - 'boot-args': (iokit/...
5
votes
2answers
4k views

MacBook Pro now asking to login with password, but can't do this via built-in keyboard

I have read a number of threads including this one How can I reset the PRAM if Recovery Mode keeps overriding the PRAM command? Where Adriano says "PRAM reset is not working because you turn on ...
3
votes
1answer
11k views

Can Find My Mac still persist after erasing the hard drive?

I have recently acquired a MacBook Air 2011 off of ebay. In order to avoid second-hand Mac issues relating to iCloud remote shut downs, I have performed the following actions: Secure erase (using ...