47
votes
iMac FaceTime HD camera shows no image/black image
I have had this problem in the past. I found my answer here. http://osxdaily.com/2013/12/27/fix-there-is-no-connected-camera-error-mac/
Open terminal from the utilities folder in the applications ...
- 661
45
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 ...
- 64.2k
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 ...
- 64.2k
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 ...
- 98.6k
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 ...
- 5,542
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: ...
- 623
29
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 ...
- 8,363
24
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 ...
- 1,073
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 ...
- 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 ...
- 98.6k
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 ...
- 356
18
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.
- 586
17
votes
Recent items menus have stopped working on my iMac
For me, this partially fixed things:
Close all open apps.
Move ~/Library/Preferences/com.apple.recentitems.plist (and ~/Library/Preferences/com.apple.recentitems.plist.lockfile if it exists) to a ...
- 271
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 ...
- 98.6k
15
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 ...
- 1,222
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 ...
- 64.2k
15
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:
...
- 76.4k
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.
...
- 64.2k
13
votes
Can I compile .NET C# code on my Mac?
You can install it with homebrew:
brew install mono
Then you can use it with:
mcs hello.cs
mono hello.exe
- 2,193
12
votes
Screen flash disabled but happens anyway
In a similar situation, I was about to give up and reboot, but then I found that restarting the audio daemon resolves the issue:
sudo killall coreaudiod
The symptom was: in the "Sound Effects" ...
- 261
12
votes
Accepted
How many external monitors does the iMac 27" with 5k display support?
The Late 2015 iMac 5K with AMD 395X can support two external 4K (UHD) displays (at the full 3840x2160 res) with the builtin iMac display set to 5120x2880 FYI. This is the configuration that I am ...
- 136
12
votes
Accepted
Harmful to never put to sleep / shut down a mac?
You can safely leave your Mac powered on all the time.
Safe and Harmless
There is no practical damage or harm that will occur because the Mac is constantly running. Use your Mac as best suits your ...
- 43.1k
12
votes
Accepted
How do I input ^ instead of ˆ
You need to go to Keyboard Preferences and add a new keyboard.
Instead of using USA International keyboard you will need to use USA Keyboard.
So from
Use instead
When you are going to add a ...
- 345
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.
...
- 98.6k
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 ...
- 33.7k
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
#####################################################...
- 97.9k
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)....
- 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
- 111
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 ...
- 64.2k
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 ...
- 64.2k
Only top scored, non community-wiki answers of a minimum length are eligible