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71 votes
6 answers

How can I download an older version of OS X/macOS?

Sometimes it's hard to search for older / previous versions of macOS & OS X on the App Store or Apple web site since they change links to promote the newest shipping version. This is an attempt to ...
Tetsujin's user avatar
  • 117k
131 votes
19 answers

How can I figure out what's slowly eating my drive space?

Every few days I get notices on my MacBook that it's running or run out of hard drive space. Curiously, restarting the computer will enable me to recover gigabytes of space (this past time, it was ...
Kyle Cronin's user avatar
  • 23.3k
55 votes
5 answers

How can I bypass Activation Lock?

I bought a used iPhone 4. The previous owner re-set the phone, but did not remove the device from their iCloud. It is asking me for their iCloud information when I try to set-up the phone. I don't ...
Leanna Gray's user avatar
78 votes
3 answers

Can I install any iOS version I wish by picking and choosing which firmware to restore?

I'm trying to downgrade my iPhone from the current iOS to an older one, as per this question. But every time I try, I always receive this error: The iPhone could not be restored. This device isn't ...
Praveenkumar's user avatar
16 votes
1 answer

Keyboard key stuck or not being recognized; how to fix

This is an attempt to write a canonical QA for this issue, as per the Meta post: Where is the list of canonical questions stored for Ask Different? I expect it to be periodically edited with the goal ...
Allan's user avatar
  • 103k
195 votes
6 answers

How do I disable System Integrity Protection (SIP) AKA "rootless" on macOS?

Apple has introduced System Integrity Protection, also known as "rootless", with OS X 10.11, El Capitan. I understand this is a step for general protection against malware but as a developer I need ...
bdnchr's user avatar
  • 2,053
169 votes
10 answers

OS X computer name not matching what shows on terminal

My computer name in System Preferences > Sharing is set to "archos", but is showing as "iphone" on Terminal. It just started doing this after I loaded Xcode for doing iPhone ...
Travis Nelson's user avatar
24 votes
2 answers

MacBook [Pro] or iMac - how many displays, what resolution/frequency?

How do I find out the number, type, resolution & refresh rate of additional monitors I can attach to my MacBook or MacBook Pro? This is an attempt at a canonical QA, as per the Meta QA - Where is ...
Tetsujin's user avatar
  • 117k
365 votes
40 answers

What Window Management Options exist for OS X?

I'd like to do something with my windows on OS X, where something includes options like re-arranging, moving, re-sizing, remembering positions, cloning across Spaces, etc. What options exist? Rules ...
14 votes
1 answer

What is an efficient way for developers / power users to use OSX window management and Spaces on a single screen?

This may be a strange question. Background: I usually work in a multiple monitor setup, where I can plaster the screen with all my windows so nothing I might need to switch to is ever hidden from ...
Philip's user avatar
  • 975
78 votes
5 answers

I don't have administrator account on my mac

On my mac I have 2 accounts and the both are normal account. So in this moment I don't have a Administrator account, only one that was in the past a administrator, but now is not. How I can have ...
João Touças's user avatar
62 votes
4 answers

GPU problem - Boot Hangs on Grey Screen

I found this according to my problem in this thread: Boot hangs on grey screen (even when booting from USB drive with fresh OS X install) My MacBook Pro 15" Early 2011 with AMD Radeon HD 6750M ...
Ghazi Marzouk's user avatar
16 votes
2 answers


Yesterday, I have tried to delete an Ubuntu partition. Since, my Mac (13", MBPro mid-2014) doesn't boot. Now, I boot on Mac OS copy with an USB. i follow different subject of this forum (like this : ...
Nicolas Lorand's user avatar
613 votes
15 answers

Shortcut for toggling between different windows of same app?

I opened two Google Chrome windows (because I am using multiple Gmails) and when I do the Cmd ⌘ Tab ⇥ shortcut it just shows me other applications that I opened but does not show me the other Chrome ...
deter's user avatar
  • 6,133
11 votes
2 answers

MacBook Air occasionally freezes when external monitor is connected

I bought an ultra wide monitor (LG 29UM58) the other day. To hook it up to my Air, I convert a mini-DP signal to HDMI. With two different cables, I started noticing occasional latency on the signal ...
Pieter's user avatar
  • 453
150 votes
12 answers

Should I disconnect my MacBook Pro's power cord when the battery is fully charged?

My friend told me that I need to disconnect the power cord when the battery is fully charged. Otherwise, I will shorten the life of the battery. Other people say you should drain it once a month or ...
Moon's user avatar
  • 4,535
8 votes
3 answers

launchd plist format for running a command at a specific time on a weekday

I'm trying to run a command at 10 minutes after 2am every weekday only. In my launchd .plist file, how can I specify this? I don't want it to run every 2 hours and 10 minutes, just once every ...
andrewz's user avatar
  • 225
12 votes
2 answers

What are the requirements to use iMac screen as a second monitor - Target Display Mode?

I have a Surface Pro 4 and an iMac (late 2019). I would like to connect my Surface Pro to the iMac to use the iMac screen as a second monitor. Is that possible? What are the requirements to use an ...
jtag47's user avatar
  • 121
40 votes
5 answers

How do I make a bootable USB OS X installer on a Mac?

Does anyone have a Terminal command-line recipe for making a new bootable USB flash drive for one of the new MacBook Air's? Is there a way to dd copy the USB boot device that comes in the box and ...
hotpaw2's user avatar
  • 5,463
13 votes
3 answers

No bootable device USB 2.0 MacBook Pro mid 2014

I've been tearing my hair out the last couple days trying to get Windows installed. I have a MacBook Pro Retina 15 inch mid 2014. Yosemite version 10.10.1. Win 7 64 bit iso (sha1 - ...
unohoo's user avatar
  • 233
20 votes
3 answers

My Mac is getting really slow, what should I do?

I bought a Mac (13", early 2011) almost 5 years ago. When I first got it, it was running under OS X 10.7 and it was pretty fast. I've being upgrading it ever since and it's now running under Mac OS X ...
tomfl's user avatar
  • 425
265 votes
3 answers

What is the "rootless" feature in El Capitan, really?

I have just learned about the "Rootless" feature in El Capitan, and I am hearing things like "There is no root user", "Nothing can modify /System" and "The world will end because we can't get root". ...
Josh's user avatar
  • 8,694
15 votes
2 answers

How to install Windows 10 into a 2011 iMac without using the Boot Camp Assistant, an optical (DVD) drive or third party tools?

Note the following regarding user TAbdiukov's question which has a links to this question. This question is about installing Windows 10 on 2011 iMac to achieve a macOS High Sierra / Windows 10 dual ...
David Anderson's user avatar
62 votes
12 answers

Is it possible to use Boot Camp with Windows 10 from an external HDD?

I need to run Visual Studio on my MacBook Pro and I need Windows to do that. The easiest and well known way to install Windows on a Mac is by running the Boot Camp app on the Mac and let it do what's ...
Matt's user avatar
  • 773
18 votes
7 answers

How can I get back a system file after deleting it from my Mac?

I've deleted a system file from my Mac and need to get it back. System files can include: hidden files in the root of / - especially unix files in /private /System files /Library files /...
grg's user avatar
  • 203k
708 votes
16 answers

How to find cause of high kernel_task cpu usage?

Occasionally my machine will have a kernel_task instance max out the CPU: This can last from minutes to sometimes hours. The machine is effectively unusable in this state. Restarting doesn't help; a ...
Adam's user avatar
  • 12.8k
53 votes
2 answers

How can I get admin access to a Mac without knowing the current password?

My Father died last year and I inherited his Mac Mini. My wife has retired and we are trying to set up the mini for her use but the changes we want to make require admin access and we do not have the ...
Eric G. Taylor's user avatar
38 votes
8 answers

How do I create El Capitan installer on a Catalina (or post-El Capitan) installed Mac for use on USB boot installer?

I have downloaded the El Capitan DMG file (InstallMacOSX.dmg) provided by Apple. The expanded DMG image contains the package "InstallMacOSX.pkg" which should be run to create the El Capitan ...
mhaselup's user avatar
  • 635
8 votes
2 answers

Fully charged MacBook Air turns off when power cord removed

I have a MacBook Air, 2009, with a recently replaced Apple battery in December 2012. Recently, when power cord comes off, the computer shuts down. Also, it usually will not restart unless power cord ...
David H's user avatar
  • 81
70 votes
8 answers

How do I write to NTFS drives in OS X?

What is the best, easiest, preferably cheapest way to make OS X write to NTFS-formatted drives in Mac OS X?
Markus Hedlund's user avatar
14 votes
3 answers

Boot camp install of Windows issue, no bootable devices

So I have a 2010 15" macbook pro (MBP6,1) and I replaced the optical drive with a hard disk. I wanted to install windows 7 on the hard disk with boot camp with a USB and ISO image. After searching I ...
user8363's user avatar
  • 305
102 votes
8 answers

How do I assign a keyboard shortcut to an AppleScript I wrote?

How do I assign a keyboard shortcut to an AppleScript? I found a script for automatically going back to the inbox in Office 2011.
Tom's user avatar
  • 1,037
101 votes
7 answers

Isn't Inactive memory a waste of resources?

I'm looking for explanation of memory usage on my machine especially in light of the example in this screenshot below: I understand what is Free and Active means But what are the meanings of Wired ...
GusDeCooL's user avatar
  • 2,778
87 votes
5 answers

How do I remap a key in macOS Sierra, e.g., Right Alt to Right Control?

I used to use Karabiner to remap Right Alt to Right Control (as an Emacs user I use Control MUCH more that Alt) but updating to Sierra broke this. Downgrading is not an option. How do I manually ...
Steven C. Howell's user avatar
68 votes
13 answers

Can I create a keyboard shortcut to open a specific application on OS X?

I want to create a keyboard shortcut to i.e. open Firefox while I am working in another application. I know I can use ⌘ CMD+T when I am in Firefox to open a new tab. I haven't found a way to create ...
politicus's user avatar
  • 1,193
40 votes
8 answers

Resizing or expanding a CoreStorage volume

I bought a new SSD with 750 GB and made two partitions: 600 GB and 150 GB. The smaller one was thought to be a Bootcamp partition one day, but to date it was just another unused partition. When I ...
Christian's user avatar
  • 527
8 votes
3 answers

Mid 2012 MBP shuts down claiming no power with charge at 30% or 40% or more

I have two mid 2012 MBPs. Sometime last year they both started randomly shutting down and showing the 'please plug me in to power' image when trying to start them up. That would be fine if the batter ...
Ram's user avatar
  • 399
263 votes
8 answers

How can I manually delete old backups to free space for Time Machine?

I use a Time Capsule for backup and now I want the drive to back up data from an extra Mac. But the drive is filled up with old backups from Mac 1. There simply is not enough space available for the ...
Jesper Rønn-Jensen's user avatar
32 votes
6 answers

Are OS X shutdown cause and sleep cause numbers listed/explained anywhere?

The numbers in which I'm most interested -2 0 3 5 … I might add to that shortlist. What do those numbers mean; where might we find authoritative explanations? Somewhere in Apple open source, ...
Graham Perrin's user avatar
237 votes
15 answers

Best app to switch between all open windows

After 4 years of being a Mac user, there is only one thing that I still miss from the Windows world, and that is being able to switch with a single keystroke between all open windows in the computer. ...
Sergio Acosta's user avatar
88 votes
5 answers

On OS X, what files are excluded by rule from a Time Machine backup?

In addition to whatever files I may choose to exclude, what files does the system exclude by rule or classification? It might make sense not to backup Trash or Caches, but I'm looking for a way to ...
bmike's user avatar
  • 238k
82 votes
6 answers

How to add characters to the press and hold character picker in OS X Lion?

In OS X Lion, there is a very useful feature for people like me who need to write in multiple languages, which pops up a small menu of additional characters when you hold down a letter. For instance, ...
houbysoft's user avatar
  • 9,172
10 votes
3 answers

External monitors show blank screen until restart

MacBook Pro (15-inch, 2016) with 2 USB-C to HDMI adapters. The setup works great if I start up in that configuration. If I connect the adapters while the machine is running or simply sleeping, one ...
Pez's user avatar
  • 111
6 votes
2 answers

Revert to El Capitan

I'm having major 'disagreements' with Sierra, compatibility issues with software etc, & have decided to revert to El Capitan. I have done this many times in the past, tested an OS then gone back ...
Tetsujin's user avatar
  • 117k
5 votes
2 answers

Drivers not working on Windows 10 installed (CLI process) on external SSD running on MacBook Air 2018

I have a problem with the installation of Windows 10 (November 2019) on my MacBook Air 2018. I tried to use a virtual machine the first time, but some drivers did not work (trackpad, audio and ...
Alessandro Pani's user avatar
17 votes
1 answer

What and how does macOS Mojave implement to restrict applications access to personal data?

As well as many of the other features talked about during macOS Mojave's release like dark mode and the addition of new apps like Home, another key feature of macOS Mojave seems to be it's heightened ...
Tom's user avatar
  • 665
14 votes
4 answers

What is a Kernel Panic and what does it mean?

I have this report: Anonymous UUID: Removed Tue Aug 11 20:26:13 2015 *** Panic Report *** panic(cpu 2 caller 0xffffff8028bc1cde): "launchd died\nState at Last Exception:\n\n"@/SourceCache/xnu/...
Jessa 's user avatar
  • 141
11 votes
2 answers

What procedure should be followed post spilling fluids onto a MacBook keyboard?

I know the first thing to do is dry with a towel the majority of the fluid. Next is to turn off the computer. Then flip over the laptop itself and whilst upside down cool dry the keyboard with a ...
kanayt's user avatar
  • 381
11 votes
2 answers

How can I use Windows to create an OS X El Capitan or macOS Sierra USB flash drive installer from the disk image (.dmg) file downloaded from Apple?

There are many posts on the Internet where instructions are given for creating OS X USB installers by using the TransMac and other such applications on a Windows machine. Many of these posts assume ...
David Anderson's user avatar
51 votes
6 answers

Is the Macbook 12 inch's USB-C charger interchangeable with other USB-C chargers or devices?

If there is only the Macbook 12 inch USB-C charger nearby, can it be used to charge other USB-C devices, such as any Android phones that also use USB-C? (will it be "too powerful" and damage other ...
nonopolarity's user avatar
  • 9,608

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