Tag Archives: OS X

The curious case of the persistent image

The case of the persistent image

The other day I was working on some blog posts, and when I pulled up an image in Preview to edit it, I noticed something odd. It looked like the Preview window was transparent, and that I was seeing a window through it. I thought nothing of it until a few minutes later when I closed a number of open windows on my new 27-inch iMac and noticed that a faint “echo” of those windows was visible on my desktop photo. I realized I was seeing some image persistence.

This is nothing new; back in the days of PCs with cathode-ray tube monitors, it was quite common to see the C: prompt burned into some screens, visible even when the monitor was turned off! But this was a bit of a surprise, since I hadn’t experienced image persistence for a long time. And on a brand new 27-inch iMac? Ouch.

I’m guessing that something kept my iMac display from going to sleep, resulting in the “burn in.” I usually have the display set to go completely dark after 15 minutes, and had never seen this happen before on this or my previous 27-inch iMac.

Immediately I went to the Apple support communities and searched for image persistence and image retention, and I found that this has been a fairly common issue with the new devices. Not only are iMacs prone to persistent images, but some MacBooks are also seeing the problem. (Mike Rose experienced the image persistence issue specific to the MacBook Pro Retina models with LG panels, and ended up having his screen replaced.) There are a number of people who were so concerned that they brought their devices back to the Apple Store and asked for a replacement, but Apple believes that the problem is common to IPS (in-plane switching) LCD panels and not a real issue.

Apple recommends doing exactly what I had been doing — setting display sleep after 15 minutes of non-use. Fortunately, they also have instructions on what to do if your get a burned-in image despite using display sleep. In knowledge base article HT5455, “Avoiding image persistence on Apple displays,” there’s a section on using a screen saver to eliminate a persistent image:

  1. From the Apple () menu, choose System Preferences, and then click “Desktop & Screen Saver.”
  2. Click the Screen Saver tab.
  3. Choose a screen saver.
  4. Set the “Start screen saver” time to be shorter than the “Display sleep” and “Computer sleep” settings in the Energy Saver pane of System Preferences.
  5. To clear the persistent image, allow the screen saver to run for approximately as long as the image was being displayed.

I had no idea how long the image had been “stuck” on my screen, so I just decided to change the screen saver time to five minutes and the display sleep time to three hours and let the “Flurry” screen saver run for that length of time.

Sure enough, once I returned to my iMac this morning, the annoying persistent images were nowhere to be found. One commenter in the support community suggests that this might be a problem with all IPS LCD panels made by LG, and that this didn’t happen with display panels made by Samsung — a company that Apple seems to want to avoid at this time due to the lawsuit situation going on.

Regardless of the cause, it’s refreshing to know that there is a way to correct it and that this does not cause permanent damage to the display. I’ve changed my iMac settings to go to screen saver after five minutes and to display sleep after 15 minutes, and hopefully I’ll never see those persistent images again.

Have any TUAW readers experienced this problem? Did running the screen saver work to eliminate the ghosted images? Let us know in the comments.

The curious case of the persistent image originally appeared on TUAW – The Unofficial Apple Weblog on Mon, 18 Feb 2013 13:00:00 EST. Please see our terms for use of feeds.

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from TUAW – The Unofficial Apple Weblog http://www.tuaw.com/2013/02/18/the-curious-case-of-the-persistent-image/

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Use These Keyboard Shortcuts To Reboot Or Shutdown Your Mac Instantly [OS X Tips]


I’ve been a Mac user since the Performa 638 CD I purchased in 1994, and I had no idea these shortcuts existed. While I wouldn’t recommend them to every Mac user, if you’re comfortable with the potential issues of immediately shutting down your Mac, you’ll want to learn these post-haste.

Note that when we refer to the Power button below, you may see an Eject button instead. Use either the Power or Eject button, whichever is in the upper right of your keyboard, to activate the following instant actions.

To reboot your Mac instantly, hit Control-Command-Power/Eject. To immediately shut down your Mac, hit Command-Option-Control-Power/Eject. To Log yourself (or any user) off of your Mac without using a menu or mouse, hit Command-Shift-Q.

To put your Mac right to sleep, the poor dear, hit Command-Option-Power, and hold them down for two seconds or so. To turn off your Mac’s display immediately, hit Shift-Control-Power. Go ahead, try it! To wake your screen back up, just hit the Spacebar key.

Now you have the magic keys to the kingdom, at least as far as shutting down or restarting your Mac on the fly without needing to use an onscreen button, mouse, or menu. Just remember that with great power comes great responsibility.

Source: OS X Daily
Image: Håkan Dahlström, Flickr

from Cult of Mac http://www.cultofmac.com/210965/use-these-keyboard-shortcuts-to-reboot-or-shutdown-your-mac-instantly-os-x-tips/

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How to reset Lion back to the Setup Assistant

There have been previous hints on how to reset earlier versions of Mac OS X to delete users so that it boots to the Setup Assistant again. This can be useful if you are passing on or selling your computer to someone else. The most recent hint was posted in 2007 for Mac OS X 10.5 and there were significant corrections included in the comments. There is also a command that changed in 10.7 (also in the older hint’s comments) and even with the modifications suggested in the comments, the hint is still incomplete.

So instead of adding yet another modification in the comments of a hint related to 10.5, I thought I would submit a new hint brining everything together from the old hint, its comments, changes needed for 10.7, and the missing items I have found. This provides a current version of the hint for 10.7 and presumably 10.8 …

from MacOSXHints.com http://hints.macworld.com/article.php?story=20121202080339900

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New Command-Line Utilities in Mountain Lion

“caffeinate” is a fun name.

from Daring Fireball http://apple.blogoverflow.com/2012/07/interesting-new-unix-commandsbinaries-in-os-x-mountain-lion/

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Bring Back Save As To Mountain Lion, Weep With Joy [OS X Tips]

Welcome back! We’ve missed you!

When OS X Lion debuted, our old-friend Save As… had been sent packing for a new imposter, Duplicate. We tried to like this new one, but wow was it not the same. Luckily, Mountain Lion has brought Save As… back, only in a sneaky, less than obvious way.

We want to share how to see the Save As… command, of course, with a simple key press, but we’ll go even one step further, clueing you in on how to return good-old-Save As… to its former glory, in the exalted spot it used to reside in. Here’s how.

If you’ve upgraded to Mountain Lion, you’ll be able to do this right away. Launch something simple, like Text Edit, from the Applications folder. Open a file or just make changes to the one that’s been restored to your view. Then, click on the File menu. Notice, Duplicate, the meanie, is still there. Now press the Option key. Huzzah! There’s Save As… hiding out and waiting for you. It’s even got a shortcut, though it requires the Option key: Shift-Command-Option-S will bring you back to the nirvana state of Save As… functionality.

But what if you really want to go back to the way it should be the way it was? There’s a simple way to do this, devoid of any hacking or terminal-fu.

Simply launch System Preferences from the dock, and click through to Keyboard, then Keyboard Shortcuts. Click on Application shortcuts in the left hand column, and then All Applications on the right. Then, click on the plus sign underneath the right hand column. Type in Save As… in the Menu Title field, and then click into the Keyboard Shortcut field. Now, press the keys you want for your shortcut, like Command-Shift-S. Mac OS X Mountain Lion will add that into the field, and clicking Add will commit it to memory.

Do the same for Duplicate, only adding a shortcut like Command-Option-Shift-D. You should now have two new shortcuts that will work across applications with the Duplicate/Save As… functionality. Test it out – in Text Edit, if you click on the File Menu, you’ll see both Save As… and Duplicate, and their associated keyboard shortcuts. Now that’s worth the price of admission, right there.

Super secret pro tip? If you actually remap Duplicate to Command=Shift-Option-S, you’ll hide it, much in the same way Save As… was hidden when you started this whole rigamarole. Pretty fancy, eh?

Now if only Apple would realize that Save As… is the way to go and restore it by default, we’d all breathe a bit easier.

Are you using OS X Mountain Lion? Got a tip you want to share with us? (sorry, you need Javascript to see this e-mail address) or leave a comment below.


from Cult of Mac http://www.cultofmac.com/181989/bring-back-save-as-to-mountain-lion-weep-with-joy-os-x-tips/

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Mountain Lion Server May Look Limited, But It Still Has Enterprise Bones [Feature]

Appearances can be deceiving. Mountain Lion Server still has solid enterprise capabilities.

Apple has released two documents about Mountain Lion Server ahead of this month’s Mountain Lion (and Mountain Lion Server) launch. The first, a 25 page product guide, offered a some insights into the changes and new features that Apple wants to highlight for customers. The second is Apple’s Advanced Administration guide, an in-depth document that would be nearly 400 pages is it were printed or packaged as a PDF. This guide is the full documentation for Mountain Lion Server and it offers a lot of information about all the changes that Apple has made since Lion Server shipped last summer.

On the surface, these two guides are enough to make longtime OS X Server administrators nervous at Apple’s removal of the advanced admin tools and features that have been in nearly every previous OS X Server release. It’s very easy to look at the contents of the Advanced Administration guide and assume Apple is completing the consumerization of its server platform.

Digging a bit deeper, however, reveals that Apple may actually have a winning strategy in the way that it continues to integrate iOS and Mac management into a single workflow and that not all of the capabilities from previous iterations of OS X Server have been scrapped.

Let’s start with the bad news. Server Admin and Workgroup Manager are indeed gone. The Server app and web-based Profile Manager, both introduced in Lion Server, are now the primary administration tools.

The long running Mac client management system known as Manager Preferences, which was largely administered using Workgroup Manager, appears to be gone as well.

All in all, it looks like the OS X Server that many Mac IT folks are familiar with is gone and isn’t coming back. Without a doubt the familiar tools and user interfaces are gone, but much of the functionality still seems to be there.

One of the biggest questions is whether or not Apple has ditched Open Directory, the native directory service in OS X. With the push for Active Directory integration and the apparent focus of Mountain Lion Server as a small business tool, a natural assumption is that Open Directory might be deprecated and its functionality significantly reduced. That doesn’t seem to be the case. The guide contains references to all the advanced capabilities of Open Directory including support directory replication and locales (both major enterprise features), the ability to create multiple domains and multi-domain search policies, and the ability for Mac clients to be integrated with both Open Directory and Active Directory domains.

Profile Manager is the new Workgroup Manager. That seems pretty clear from looking at both documents from Apple. Many of the options that were previously set using Workgroup Manager (such as removable media access restrictions, Dock settings, and a custom login window on managed Macs) are now listed as items that can be set using Profile Manager. That implies that one of the tasks Apple did between Lion and Mountain Lion was shifting the client management data out of Open Directory and into Profile Manager. That would be a logical process (and one assumes straightforward) since Managed Preferences data is stored as XML data and that Configuration Profiles created and used by Profile Manager are essentially just XML files.

Centralizing Mac client and iOS device management in a single tool makes a great deal of sense. It allows administrators to visualize and work with user, group, device, and Mac policies in a single interface. That eliminates a lot of redundancy and makes it easier to avoid and troubleshoot mistakes.

Profile Manager has two other big advantages over Workgroup Manager. Being web-based, Profile Manager allows IT professionals to administer Mac client and iOS device management from virtually any computer or device they want. A Mac admin workstation is no longer required.

The second bit advantage is that Apple developed a self-service portal for users as part of Profile Manager. That means an administrator can create the needed profiles and associate them with user accounts, Macs, or iOS devices (or groups of them) and users can enroll whatever devices they want to use for work. Any settings, apps, or restrictions are then propagated without no further effort on the part of IT.

Some enterprise services are still there, but somewhat disguised. One example is RADIUS authentication. RADIUS is a network service that allows users to connect to Wi-Fi networks using the username and password. That makes life easier for users, but it has a lot of value as a security tool because there is no single password that is shared with everyone who uses the network. In the Advanced Administration guide, RADIUS is referenced, but its initial reference is described as “Manage Wi-Fi” – that’s something easily missed if you’re looking for the name RADIUS.

In the end, the story of Mountain Lion Server may not be about Apple hobbling of its server platform by removing its enterprise capabilities. Instead, it might be about how Apple has taken those capabilities and created a new interface that makes them much more accessible.

Source: Apple

from Cult of Mac http://www.cultofmac.com/178878/mountain-lion-server-may-look-limited-but-it-still-has-enterprise-bones-feature/

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Safely Move Keychain Files From Your Old Mac To A New One [OS X Tips]

Copying files to a new Mac? Perhaps one of them newfangled MacBook Pros? While most of us use Migration Assistant to move our files from one Mac to a new one, it may not be an option in your particular case. I’ve definitely wanted to move just the bare minimum of files over to a new Mac before, and today’s tip should help with just that.

The Keychain is a place to store passwords and login information, and it’s fairly easy to move your Mac’s Keychain to a new one. Here’s how.

Start on the Mac you want to move the Keychain file from and hit Command-Shift-G to get the Go To Folder text field. Type in the following path to go to your Keychain folder:

Once there, copy the file named login.keychain using whatever method you find best. You can copy it to a flash drive, external hard drive, or what have you. Just remember that this is sensitive information, so don’t go emailing it.

Take the file over to the new Mac and open Spotlight with a click on the magnifying glass icon in the upper right or by hitting Command-Space on your keyboard. Search for Keychain Access in Spotlight and launch the app when it appears as your Top Hit.

In Keychain Access, choose Add Keychain from the File menu. Browse to the file you copied from the old mac, whether it’s on a USB stick or a folder on the new Mac. Click on the Add button and the new Mac will import the Keychain data right to your new Mac computer. If you feel like testing it, head to a web page or use an app that you typically use Keychain to unlock or login with.

Be sure to securely delete the file you copied over to the new mac from your thumb drive or whatever you used. Secure Empty Trash in the Finder menu is your friend for doing this.

Got an OS X tip? Need help troubleshooting OS X? (sorry, you need Javascript to see this e-mail address) or leave a comment below.

Via: OS X Daily

from Cult of Mac http://www.cultofmac.com/178758/safely-move-keychain-files-from-old-mac-to-new-one-os-x-tips/

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Make Your Mac Read Documents To You [OS X Tips]

Sure would be great to listen to every day documents easily, say, on a long drive or airplane commute. There are a ton of ways to make this happen, including some third party apps, but this is a pretty slick, easy way to turn any text you can highlight into spoken text that can be put on an iPhone, iPad, or iPod, ready to go along with you.

First up, it’s good to understand that this is essentially an Automator service. Introduced in Snow Leopard (and available in Lion), the service must be enabled first. To do that, launch System Preferences, which is found in the Applications folder. Once launched, click on the Keyboard preference pane icon, then the Keyboard Shortcuts tab.

Next, click on Services in the left column, and then scroll along down to the Text section. Click the box next to the Add to iTunes As A Spoken Track service. Go ahead and quit out of System Preferences.

Now all you need to do is open any text document or PDF that you can select the text in, select it, then go to the application menu. For example, I used Preview to pull up a text document, I highlighted the text in it, and went to the Preview menu. Select Add to iTunes as a Spoken Track.

Once that’s done, you’ll have the option to choose a voice from your installed system voices (more on this later this week), and decide what to name the resulting file. When you hit the Continue button, iTunes will open if it isn’t already, process the file, and a chime will play when the task is completed. A larger amount of text thrown at it will take longer, of course, and is dependent on your Mac’s speed and memory.

Choosing a location different than the default didn’t seem to matter when I tried this; I found the files in my iTunes song list either way. Play the new spoken track in iTunes, or send it to your iPhone for on the go spoken document goodness.

Source: Macworld

from Cult of Mac http://www.cultofmac.com/169999/make-your-mac-read-documents-to-you-os-x-tips/

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