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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High fan, No battery symbol, Battery not charging on Macbook Pro Mid 2009

Recently, my MacBook Pro has had the following issues: If the battery dies, I need to do an SMC reset for it to even start up. When it does, the fan is running at high speed and there is either no ...
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12 views

Under what circumstances would the startup chime enable itself?

After doing some reformatting/reinstalling a couple a weeks ago, the startup chime on my Macbook has never gone off when I turn it on for the past few weeks. However, when I tuned on my Macbook Pro ...
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1answer
43 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 ...
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0answers
41 views

Slow Mac Mini Performance [closed]

Mac Mini suddenly becomes slow and takes a long time to boot. But it runs fine if I clear the PRAM (by pressing Command+Option+P+R) at the system startup. But it becomes slow if i put my Mac on sleep ...
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40 views

Macbook Pro black screen

I have a Macbook Pro from 2012 with Yosemite. It was working just fine when I decided to update Xcode. The screen froze after a few seconds, and after a few minutes it went black like it went to ...
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2answers
3k views

El Capitan /private/var/folders cache files consuming 30–40 GB

I've upgraded my MacBook Pro to El Capitan recently, and one of the first unpleasant changes, other than XtraFinder & TotalTerminal no longer being compatible, is that the system deems it ...
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101 views

rMBP 2015 onboard keyboard and mouse unresponsive intermittently, but can occasionally fix

I've recently been having a problem with my 2015 macbook pro. Sometimes after waking up from sleep or after powering on, both the keyboard and mouse are completely unresponsive, forcing me to use an ...
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1answer
63 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 ...
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300 views

Spoofing a serial number on a MacBook Pro

I have a MacBook Pro that got liquid spilled on it. I cleaned it up and everything works except the fact that it no longer has a serial number. When I go to look at System Information, it says "Serial ...
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175 views

can't open the “Bluetooth” preference pane after resetting NVRAM

Not sure if the two issues are related, but I had to reset my Mac's NVRAM, using this tutorial. I later noticed that my bluetooth keyboard and trackpad don't work anymore, and when I try entering ...
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65 views

“use-nvramrc?”=false when disabling safe sleep

this is my first question here. I suppose it belongs here to the Apple StackExchange, but I'm not entirely sure it's not actually more of a Bash question, so in case I apologize for the error. I want ...
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1answer
102 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 ...
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1answer
139 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 ...
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5answers
14k views

Desktop icons have disappeared after using HDMI cable (Yosemite)

I had a strange issue recently where I had to reset PRAM after using an HDMI cable with my MBP (it had a blank screen on boot). I feel like this is again related to the HDMI cable. After using it, ...
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1answer
8k 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: ...
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3answers
3k 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 ...
2
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1answer
5k 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 ...
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1answer
15k 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 ...
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1answer
2k 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?
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184 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 ...
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1answer
703 views

(Update Needed?) after PRAM reset, File Vault seems bricked

After many system instabilities and freezes I was suggested to do a PRAM reset. When I boot now and the File Vault asks for the password to decrypt the SSD the Guest user is gone and my user lost his ...
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1answer
114 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
368 views

nvram -p shows “LocationServicesEnabled %01” … does that mean I have a GPS?

What does LocationServicesEnabled mean on a MacBookPro Retina?
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1answer
1k views

Troubles with resetting PRAM

I followed Apple's instruction to reset PRAM ("Press and hold the Command-Option-P-R keys before the gray screen appears.") and the only thing that happened was that my Mac rebooted repeatedly until I ...
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8k 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 ...
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282 views

Mac OS X Base System interference

I have reviewed what has been written here regarding the Mac OS X Base System and I am still scratching my head. The impetus for this inquiry is how these partitions interfere with booting problem ...
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1answer
403 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. ...
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1answer
1k 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 - ...
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3answers
10k 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 ...
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2answers
2k 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 ...
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3answers
6k 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 ...