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The 2024 Developer Survey results are live! See the results
44 votes
Accepted

My Mac repeatedly beeps three times on startup. What does this mean?

No, your Mac is not possessed. And Yes, it’s trying to tell you something! A looping three beeps in between three seconds during startup is your iMac’s way of telling you that the operating system ...
Monomeeth's user avatar
  • 64.7k
39 votes
Accepted

Is it possible to use my Mac to mine Bitcoins?

Short answer Is it possible? Yes. Will the benefit outweigh the costs? No. Long answer Without going into a lot of detail, and at the risk of oversimplifying things, in the early days mining ...
Monomeeth's user avatar
  • 64.7k
38 votes
Accepted

How to charge MacBook Pro quickly from an iMac?

This cable costs $39 retail. At this price I am expecting better performance for charging than what I'm getting here. How could I diagnose this issue? There's nothing to diagnose because ...
Allan's user avatar
  • 103k
34 votes

Does unlicensed Apple hardware damage a late 2015 iMac?

Mice are mice. Any USB mouse will be fine. If that mouse has more than two buttons and a scrollwheel, you may need software to use all of its features, so look for a manufacturer that provides ...
Marc Wilson's user avatar
  • 6,525
33 votes

How to stop iPhone from listing iMac as audio source during phone call?

On your iPhone, go to Settings > Phone > Calls on Other Devices > un-check the Mac. Then switch off the "Allow Calls on Other Devices" toggle switch and restart the phone. Also worth mentioning: ...
Employee's user avatar
  • 643
30 votes

Put the display to sleep without putting the whole computer to sleep?

In Terminal.app: pmset displaysleepnow https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man1/pmset.1.html This also works for the lock and sleep functions: pmset ...
pkamb's user avatar
  • 9,020
25 votes
Accepted

How to examine disks and their partitions via terminal?

Examine with diskutil list diskutil info /dev/disk0 (disk0s1 etc.) sudo gpt -r show disk0 fdisk /dev/disk0 (make/change partitioning with MBR) sudo gdisk -l /dev/disk0 (make/change partitioning ...
bomben's user avatar
  • 1,093
22 votes

Does unlicensed Apple hardware damage a late 2015 iMac?

While it is certainly possible to hook up hardware that can damage a computer, that's nothing specific to Macs, it's specific to that hardware. And usually that's because you're hooking up something ...
jwenting's user avatar
  • 439
20 votes
Accepted

Do LAN transfers use both Ethernet and WiFi by default?

Do LAN transfers use both Ethernet and WiFi by default? No. The default action is to use the one with the highest priority. This is usually done by the order of the interfaces that you specify in ...
Allan's user avatar
  • 103k
19 votes
Accepted

What is this black bar at the bottom of my Dock?

Occasionally the progress bar that appears under the downloads folder does not go away as it should when the download completes. You should be able to remove it by simply restarting the computer or ...
Alex Nussey's user avatar
19 votes
Accepted

How can I adjust brightness of 3rd Party external monitor on iMac, Macbook or Mac Pro via keyboard?

I have been using Monitor Controll - https://github.com/the0neyouseek/MonitorControl - for a couple of months now with a Dell screen, and I have only words of praise.
Kolja's user avatar
  • 696
17 votes

How do I stop my computer name from automatically, and incorrectly, changing?

Workaround Like other users, I'm plagued by this annoyance but have found a semi-satisfactory workaround: my_hostname='your-hostname-here'; for key in LocalHostName ComputerName HostName ; do sudo ...
TrinitronX's user avatar
  • 1,252
16 votes

Do USB-C to Thunderbolt 2 cables exist?

I don't think a straight-up cable exists, no. However, you can get an adapter/dongle that works perfectly well for your scenario. You'll need to Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 adapter: ...
jksoegaard's user avatar
  • 78.6k
16 votes
Accepted

Do USB-C to Thunderbolt 2 cables exist?

You're not going to find a Thunderbolt 3 to Thunderbolt 2 cable as an adapter is required to connect to legacy devices. One of the (major) differentiators between Thunderbolt 1/2 and Thunderbolt 3 is ...
Allan's user avatar
  • 103k
15 votes
Accepted

How can I speed up my new (but slow) 2017 iMac?

Why does it feel so slow? Your iMac has a 1TB 5400rpm SATA Hard Drive and this is what’s causing the bottleneck. Your mid-2010 iMac would have had a 7200rpm Hard Drive. To fix this you really need to ...
Monomeeth's user avatar
  • 64.7k
15 votes

Bluetooth audio is choppy / stuttering

For users with the M1 chip (also works with intel Macs): If you're encountering stuttering issues, it's worth checking the number of connected Bluetooth devices. If you have three or more devices ...
Efekan's user avatar
  • 251
14 votes
Accepted

Really confused about how to reset SMC and PRAM and NVRAM on my Macs and iPad and iPhone?

Sorry to hear you’re having problems. I hope the following clarifies things for you, but if these instructions do not help, you can always post specific questions about any problems you’re having. ...
Monomeeth's user avatar
  • 64.7k
13 votes
Accepted

What happens if I connect a charger via USB-C to an iMac (M1 2021)?

The docking station in question lists iMac as a compatible device but could this damage the iMac, or the docking station itself, because it is always connected and trying to power the iMac? Your iMac ...
Allan's user avatar
  • 103k
12 votes

How to control fan speed in macOS Sierra?

I am a firm believer in avoiding software "hacks" to fix hardware issues. To fix this problem, you need the sensor. Unfortunately, as you have found out, your SSD doesn't support this connection. ...
Allan's user avatar
  • 103k
12 votes

How do I make an HDD as fast as an SSD?

I'm afraid that's impossible. Your hard drive is essentially not much different from an old record turntable: it has spinning disks and a 'head' that writes or reads the magnetic stripe at a point on ...
benwiggy's user avatar
  • 37k
12 votes
Accepted

M1 iMac: libdvdcss missing

You can get an ARM version via Homebrew: $ brew install libdvdcss ... ==> Downloading https://ghcr.io/v2/homebrew/core/libdvdcss/manifests/1.4.3 #####################################################...
nohillside's user avatar
  • 102k
11 votes
Accepted

xpcproxy using all my bandwidth

In my case, it was nsurlsessiond (by sudo lsof | grep -i nsurl) Fired up Charles with https MITM'ing, but didn't find anything talking to Apple (but it wasn't making any new connections to intercept)....
dhchdhd's user avatar
  • 301
11 votes

After El Capitan update, I cannot sign in to anything with my Apple ID: '"This action could not be completed. Try again"

Execute the following commands in Terminal: sudo mkdir -p /Users/Shared sudo chown root:wheel /Users/Shared sudo chmod -R 1777 /Users/Shared
Pradeep R B's user avatar
11 votes
Accepted

Is there a way for me to view my work or my whole iMac screen in grayscale?

Yes you can! Follow these steps: Go to Apple > System Preferences > Accessibility In the left hand pane make sure Display is selected On the right hand side you’ll see a number of checkboxes and ...
Monomeeth's user avatar
  • 64.7k
11 votes
Accepted

Is my brand new iMac Pro display faulty? There's a dark band beneath the menu bar

No! Your iMac Pro is not faulty! I also have an iMac Pro, and below is a screenshot of the same section of the screen. My desktop background (i.e. wallpaper) is actually a photo taken by one of ...
Monomeeth's user avatar
  • 64.7k
11 votes

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

No. You cannot do this. The 2019 iMac is not supported for Target Display Mode. This is an attempt to write a canonical QA for this issue, as per the Meta post: Where is the list of canonical ...
Allan's user avatar
  • 103k
10 votes
Accepted

Why is a 2.7 GHz iMac slower than a 1.8 GHz MacBook Air?

The examples you've used in your question can be explained by the use of the SSD in the MacBook Air. In March 2014 I installed a hybrid drive (what Apple calls a 'Fusion' drive) into a late 2008 ...
Monomeeth's user avatar
  • 64.7k
10 votes

Why does my Magic Trackpad 2 randomly disconnect and stop clicking?

Well, I had the same problems on My Macbook Pro 2018 with randomly disconnecting magic touchpad and keyboard. I found a resolution here: https://www.reddit.com/r/macbookpro/comments/9brybd/...
Maxim Uvarov's user avatar
10 votes
Accepted

How can I enter recovery mode (for Mac OS, on an iMac) remotely?

You can set NVRAM options from command line to boot into recovery: sudo nvram "recovery-boot-mode=unused" sudo reboot This will put your system into recovery mode. NVRAM (nonvolatile random-access ...
Volsk's user avatar
  • 3,070
10 votes
Accepted

Can I flush, or release, my GPU memory?

I have found the answer to actually be 'yes' you can release (flush) the VRAM. Here's what worked for me: I have a hot corner (MacOS) set to turn the display off, and when I activate it, even just ...
v15's user avatar
  • 899

Only top scored, non community-wiki answers of a minimum length are eligible