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

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1answer
52k views

Resetting PRAM without a(n) (Apple) keyboard?

A while back I had an issue with my (2013) iMac not recognizing the keyboard after it was unplugged and re-plugged in. I had to actually power down the iMac and power it back up before it would ...
3
votes
3answers
6k views

Clearing NVRAM on Yosemite shows password entry

When I make the ⌘ Cmd+⌥ Opt+P+R it shows a dialog with lock symbol and to proceed I have to give the password but this way I'm not able to proceed with the resetting of the PRAM. How can I reset the ...
1
vote
1answer
244 views

MacBook Pro (late 2013) w/ Yosemite & FileVault won't boot: LCD light only, no other activity

After lid-sleeping my machine with ~10% battery left, a few hours later, attached to AC power, it would not wake from lid-open, keypress, or short power-button-press. After doing a long-power-button-...
1
vote
1answer
307 views

Do I need NVRAM/SMC reset to restore a used MacBook Air to defaults?

I've bought a used MacBook Air (Mid 2013) running Yosemite and I'd like to restore every setting to defaults, as in, start over with a fresh clean OS. What are the things I have to run to make sure ...
2
votes
1answer
237 views

Yosemite turns on “reduce transparency” at every login or wake after battery failure

Recently, I was using my rMBP on battery power, with about 20%-30% remaining battery, according to the battery indicator. It suddenly shut off, and would not power on (not even showing the "battery ...
2
votes
1answer
265 views

MacBook Pro Mid 2012 startup chime from right speaker only

After installing a ssd into my Macbook pro mid 2012 (not retina), i noticed that the startup chime is coming only from the right speaker. (I am not sure if it was always like that or if its because of ...
5
votes
1answer
12k views

What does “sudo nvram boot-args=”debug=0x10“” do to my Mac?

Because Parallels Desktop 10 and Fusion 7 both run slow on Yosemite, there are KB articles which make the users execute sudo nvram boot-args="debug=0x10" For instance here: http://kb.parallels.com/...
3
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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 ...
3
votes
1answer
5k views

nvram boot-args to boot in target disk mode

I'd like a Mac to always boot in target disk mode. Similarly to setting sudo nvram boot-args="-v" which boots in verbose mode, I tried sudo nvram boot-args="-t" but to no avail. Any idea?
2
votes
1answer
108 views

System boot chime right speaker only

I recently replaced the internal hdd inside my macbook pro mid 2012 with a ssd. Now it seems that the system chime (the "boong" that goes off when i turn it on) only plays through the right speaker. ...
0
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1answer
317 views

Loading gif and progress bar on start up

After doing a pram and a smc reset my late 2011 mac book pro 10.8 shows the apple logo on a grey screen with a loading gif and a progress bar which once finished the mac just turns off. I have got ...
0
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1answer
126 views

delay after opening lid display dark until key pressed

okay so my MBP Mid 2010 was took a little tumble (it was in a felt sleeve which was inside a backpack) today and since has been acting weird. when i open the lid, the login screen does not come back ...
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2answers
506 views
8
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1answer
14k 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 ...
0
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3answers
13k views

Poor battery performance after SSD install

I recently installed a Crucial SSD into my Macbook Pro (2.66 GHz Intel Core i7), and now the performance of my battery is probably about 50% of what it used to be. I've tried to reset the PRAM, but ...
3
votes
1answer
411 views

MacBook Pro will not wake from sleep after installing third party application

I installed an application called Air Parrot that uses air play with an Apple tv to mirror or extend the desktop. I noticed that after I installed it, I am no longer able to wake my Mac from sleep. ...
2
votes
2answers
3k views

Can't reset PRAM and reinstall OS!

I have a problem with my MacBook Pro 2010 13 inch, 2.4 GHz. Originally I had Snow Leopard installed on my Mac, then I was trying to upgrade it to Lion (official version from App Store). During the ...
2
votes
1answer
3k views

PRAM and NVRAM differences and overlap with eachother and UEFI firmware chip

Is PRAM stored on the same NVRAM chip that non-PRAM variables are stored. I always assumed that NVRAM was the UEFI firmware chip on the logic board. Are all of these one in the same (NVRAM - PRAM - ...