New iMac display on/off

Does the new iMac have an on/off button for the display that is separate from the on/off power button for the iMac itself?
It would be nice to have the ability to turn off the display, when not in use, without having to powering down the iMac.

Sleeping the entire machine is one thing. Sleeping the display is a separate issue.
It seems there's currently no way to PERMANENTLY turn off the display backlight on an iMac. Setting a display time-out in the energy-saver settings or Ctrl-Shift-eject is supposed turn off the backlight, but if you have applications running on the machine, the display will turn itself back on again after a few seconds. (Try sleeping in a room with an iMac display on. Even displaying a black jpeg with the brightness turned down, you'll need to physically cover the screen!) The backlight will normally power down properly when there's nothing running on the machine, but if the machine weren't doing anything, I'd just sleep the whole machine, not just the display!! I want to sleep just the display/backlight when there are time-consuming applications running in the background, i.e., if the machine is encoding, running backups, syncing with cloud/server drives, etc.
This thread shows many other people having the same problem:
http://mac.elated.com/2007/02/02/why-cant-you-turn-off-the-screen/
It seems this has been a problem for well over a year and I've not even seen Apple acknowledge the issue. IMHO, not being able to leave applications running with the backlight turned off is a critical design flaw. If I'd known this in advance, I'd have bought a Windows PC Now regretting my iMac purchase...

Similar Messages

Why does my iMac display go off when I am starting up or waking up my machine from sleep..

Why does my iMac display go off when I am starting up or waking up my machine from sleep..?
When my iMac goes to sleep I then later try to click the magic track pad or keyboard and it will usually then show the initial password entry login screen and then go off. The machine is still on but the display is black and will sometimes flash up the screen again if I press the magic track pad or keyboard but will then black out again..

Well, there are many different reasons why it does this. It might shut off due to power voltage problems, system overheats, or there is a System Problem. The reason it might be hard to boot up is because your power button might not work properly or your system hard drive is damaged.
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Some times my new iMacs display start flickring when I starts playing a game. I am very annoyed. I have bought it only 1 month ago. What can I do?

Some times my new iMacs display start flickring when I starts playing a game. I am very annoyed. I have bought it only 1 month ago. What can I do?

A flickering display sounds to me like a hardware problem. Or does this only happen with a specific game? Of course your machine is still under warrantee so you could take advantge of it if you have a local apple store.

Question About Previous iMac vs New iMac Display

I just purchased a refurbished iMac 27" a few days ago. It arrived. I am having trouble visually adjusting to the screen. I've done extensive research on this topic already and have seen others with the same issue. I have heard numerous reasons for the blurry vision, headaches, etc, some attributing to a gap between the glass and the display, or the glare issue. I'm considering downsizing right now to a 21" to see if that will at all help, but I noticed with the new iMacs, they are advertising the following for the display:
"You won’t want anything to distract you from what you’re viewing on these big, beautiful 21.5- and 27-inch displays. And nothing will, thanks to a new display design that reduces reflection by 75 percent. In addition, because the LCD now sits right up against the glass, your content seems to leap off the screen."
75 percent less reflection.
Full lamination has a second major benefit: It eliminates the reflection of light off the LCD panel and off the back of the display’s cover glass. But we also figured out how to reduce reflection off the front of the glass without compromising color quality. Instead of applying an antireflective coating to the glass in a conventional way, we adapted a process used on smaller surfaces like camera lenses and fighter pilots’ helmets. It’s called plasma deposition, and it involves coating the glass with layers of silicon dioxide and niobium pentoxide so precise and so thin they’re measured in atoms. The result: an astounding 75 percent reduction in reflectivity — and vibrant, accurate colors.
Is this new design made to solve the problem I am facing? Thanks for the help!

I recently had an eye examination done, and it came back perfect. This is the previous monitor I used: http://www.walmart.com/ip/AOC-931SWL/13890785
I get that it's completely different, but it didn't cause me any eye strain at all. I also tried calibrating the color, right now it's really warm, with less blue LEDs, and it's easy on the eyes, but it's definitely, still a problem.
I know that some people don't have any problem with them at all, but some others are having the same issue, but I am just trying to figure out if what Apple has done with the change in the new iMac is their solution to the problem.

New iMac display won't sleep?

Hi, new iMac 24", 10.5.7, set screen saver at 5 minutes, and display to sleep at 10 minutes. Screen saver works, but it will not sleep. I've changed the setting, and rebooted, still no luck.
I tried everything from suggestions, with no help. I found that if I turn off "screen sharing" in system preferences, it will sleep the display for whatever minutes I set. I have to leave "screen sharing" on because I have flat screen tv hooked up to watch video files on, and I use iPhone app to control screen, to hit play and pause, etc. It is set up with a password, and only my iPhone is used when I am watching something. Why should screen sharing stop display from sleeping? I've left screen sharing on since I got this, so I can remotely log in with "back to my mac" from the road, and it never stopped the display from sleeping before? I shouldn't have to turn off screen sharing just to sleep the display? Am I missing something?

This is for a Mac that won't sleep.
Here is KB article HT1776 with their tips.
Mine follow;
USB devices and hubs often cause Macs to not sleep or wake quickly from sleep (notably HP printers and scanners, HP all in ones, and Cannon scanners). Disconnect all USB except for keyboard and mouse and try. If it sleeps, add one back at a time testing after each one to find the culprit.
If you've set your Mac to receive faxes, it may not be able to sleep. It might also have a damaged preferences file.
If you use your Mac for faxing, open System Preferences. click Print & Fax, click the Faxing tab, and uncheck the Receive Faxes On This Computer box.If that doesn't work or you've never faxed on your Mac, go to Finder/Hard Drive /Library/Preferences/SystemConfiguration and delete the com.apple.PowerManagement.plist and com..apple.AutoWake.plist files (if your Mac asks, type your admin. password).
If the latter file isn't present in the folder, go to user name(probably your name)/Library/Preferences, delete the com.apple.systemuiserver.plist file, and reboot your Mac.
Hope this helps!
P.S. One member here reported this (Michael Gleason);
"I have had this problem with my IMac G5. It is surprisingly irritating. LaCie's Silverkeeper backup software was the cause. By default it gave itself permission to wake up the computer to check if a backup was needed. Do you have this or a similar program installed which has scheduled activities including wake-up permissions as an option?"
Dave Hamilton provided this link, xlr8yourmac.com, to a member, which addresses failure of deep sleep with some users that updated and added new FireWire and USB card.
Also, here is Apple KB article TA2469 about PCI cards and sleep.
tomhorvat adds this; After few days of messing around I found out that I had desktop background (wallpaper) set to change every 1 minute.
After unchecking "Change picture..." in system preferences (under Desktop/Screen saver), my powerbook went to sleep all by itself.
Tristan Currier noticed this; "I have a Canon printer(shared) and my imac would not sleep. I opened up printer/fax in system prefs and noticed it said the printer was in use when it was off. Opened up the printer queue and noticed about 7 pending documents. Deleted them all and now it sleeps.
Check the printer queue!"
Allan Jones says "sometimes there is Network activity: launch System Preferences > Energy Saver > "Options" tab and uncheck "Wake for Ethernet network administrator access."
Good Luck!  DALE

Brand new Thunderbolt display shuts off randomly

I've had a new ThunderBolt Display for less than a month paired with a brand-new Mac Mini (2.6 GHz Intel Core i7, 16 GB 1600 MHz DDR3, Intel HD Graphics 4000)
and the display just began shutting off randomly.
I also have an external HD drive daisy chained via the display's Thunderbolt port that stops working once the display dies. Tried connecting the Mac Mini alone with no hard drive figuring it might be the drive but no the display still randomly shuts off. Any ideas or suggestions before I call Applecare?

I have a similar setup and problem. My Thunderbolt display (refurb, purchased in February 2012) will randomly turn off, as if it went to sleep - but mouse/keyboard input does not wake it back up. The internal speakers will still output audio. Disconnecting/reconnecting the Thunderbolt cable from the attached Mac Mini (2.5GHz dual-core Intel Core i5, OS X 10.7.5, AMD Radeon HD 6630M ) will not resolve the issue. Disconnecting/reconnecting the display's power cord and the Thunderbolt cable from the Mac Mini will resolve the issue temporarily. This began happening maybe a month or two ago, and has probably happened 10 times in the last 30 days. It is completely random, and I have yet to be able to duplicate it on demand.
Steps taken to attempt to fix the issue:
Confirmed Energy Saver Settings
Confirmed Software up to date (OS 10.7.5)
Attempted Firmware Updates (message states not needed)
Reset NVRAM
Reset SMC (unplugging computer)
There are other discussions reporting similar behaviour:
https://discussions.apple.com/thread/3340067?start=0&tstart=0 (13 pages)
https://discussions.apple.com/thread/3352192?start=0&tstart=0 (5 pages)
https://discussions.apple.com/thread/4243396?start=0&tstart=0 (2 pages)
https://discussions.apple.com/thread/3347412?start=0&tstart=0 (1 page)
As well as other discussions concerning random flickering issues with the display.
Since I'm still under warranty, I took my display to a Genius Bar today. The rep didn't really seem to want to hear about what I found on these discussion boards. He says you can pretty much find anything you want to find here, and since it is unmoderated it is not a reliable source of information. I let him know that the issue (as far as I can tell) occurs with different models of Mac Mini's, MB Pros & MB Airs, suggesting it is in fact an issue with the display and not what's connected to it. I added that most folks who reported bringing the displays in for service ultimately ended up with a replacement display, as the service done on the defective display proved to not resolve the issue - but I would of course defer to his judgement.
He decided that they would order and replace the LCD panel. He assured me they would keep the display powered on for 12-24 hours after the service to ensure the issue has been resolved. Truthfully, I am not optimistic. And for the amount it costs to replace the panel ($833.32 from the provided estimate), I speculate this course of action will end up being much more costly for them in the long run. But we shall see!
I will be sure to provide updates as they come. Wish me luck!

New iMac Display Sizes

I'm ready to buy one of the new iMac models but when looking at the current 20", 24" monitors, I think the 24" is the largest I can comfortable accommodate on my desk.
I note that the newly released iMac is available as a 21.5" or a 27" in a 16:9 ratio. What was the old ratio, or better yet, is the viewable screen size of a new 27" the same as the old 24" or is it larger?
If the new sizes equal the viewable sizes of the old iMac screens then I can accommodate a 27" model on my desk. If it is larger, I'll have to get a 21.5".
Thanks
kayjh

Again, the important thing is pixel count. A 50-inch HDTV may have a physically larger display, but it only has 1920x1080 pixels (the same as the 21.5-inch new iMac). Larger pixels does not let you do more with your computer, MORE pixels does.
You can figure out the pixel density this way. Using the [Pythagorean theorem|http://en.wikipedia.org/wiki/Pythagorean_theorem],
!http://upload.wikimedia.org/math/1/4/5/1455314a78f39a594485adbaf74d63f9.png!
figure out how many pixels go along th diagonal. You know a (2560) and b (1440), so you can figure out c. I get 2937 pixels along the diagonal. That diagonal is 27 inches, so the pixel density (pixels per inch) is 2937 divided by 27, or about 109 ppi.
For the 24-inch display, using the same math, it is only about 94 ppi.
So objects on the new display will look about 10% smaller than they would look on the old display. The new display will also look more sharp for the same reason. And as I mentioned above, the new display has 60% more pixels to work with compared to the old display.

Question about the new IMac display 2012 and pollution

The IMac late 2010 there is the problem that the fan behind the screen and glass environment pollution such as smoke, candle soot, heating dirt etc fans were absorbed and resulted in contamination streaks on the inside of the glass cover.
A new display technology is applied to the new IMac in 2012 and thus achieved a higher density of the display. Can Apple confirm that with this new display, the old dirt from the inside of the glass are excluded and will no longer occur?
Thank you for answer

Good question, but you're not talking to Apple here, just users like yourself, so I doubt you'll get a definitive answer.

Why don't new imac display driver support rotate into portrait mode

why don't new 24 in imacs support display rotate into portrait mode? they have ati radeon HD 2600 chipset!

OK - I figured it out. Apple's 10.4 display driver does not externalize the rotate parameter for the new IMAC alum 24inch display - even though the ATI video card supports rotation.
However, the SwitchResX utility (search on google) will switch the display into rotate modes 90/180/270. I tried it and it works in 90 degree rotate.
Once you install SwitchResX, you have to do 2 steps. First, open the SwitchResX control panel and under its Menus tab, further enable its taskbar widget to allow "Display Orientation" settings. Second, then use SwitchresX taskbar widget (now displaying a new "Rotation" parameter setting for Standard - 90 - 180 - 270.
In addition (obviously ... for safety reasons) you will probably want to attach the device to a VESA standard display mount that allows safe physical rotation of the IMAC. Apple sells for $29 the VESA Mount Adapter Kit for 24-inch iMac. This will allow attachment of the IMAC to a VESA mount. (I am now researching VESA mounts).
Cheers!

Brand New iMac Display Anomalies

Hello,
Thanks in advance for any insight.
Just got a new imac and I'm starting to see weird display issues spring up randomly:
- Menu items randomly fade on main osx tool bar
- UI window drop shadows become pixelated
- Slight flickiering occasionally.
- UI menu items, when selected show mulicolored/banded distortion.
iMac 3.1 GHz Intel Core i5 with 16gb of ram. Video card is AMD Radeon HD 6970M 2048 MB. 10.7.1
Thanks!

Jer,
With due respect you shouldn't be looking for advice on a help forum with that type of issue on a brand new machine. You should be in touch with AppleCare immediately, if you haven't already purchased AppleCare you have 90 days of free phone support, that should be your first step. You can find the number for your area in your owners manual.
If you bought the machine directly from Apple you have 14 days to return it for either a refund or exchange. If you bought it from another retailer you have to work within their policies for a refund or exchange. Either way you still have the 90 days of AppleCare support and need to begin using it today.

IMac display turns off but computer doesn't sleep.

After upgrading to Mavericks I've noticed a problem where my iMac display will turn off but the computer will never enter into actuall sleep mode, I know this because I can constantly hear the fan humming. I have the Energy Saver settings set to sleep the display after 10 minutes and sleep the computer after 15 minutes. However even well after 15 minutes of inactivity (and the display long having turned off) I can still hear that the computer is not sleeping due to the fans still being on.
I decided the troubleshoot the problem using a Terminal command and I was able to narrow it down to single potential cause. According to "PreventUserIdleSystemSleep" the problem stems from a "URLConnection in progress" issue. How does one go about determining what is causing the URL Connection so I can kill the prompt and see if that solves the sleeping issue?
Here's a screen shot of the Terminal output:
Also, if I choose "sleep" from the Apple Menu, the iMac will go to sleep as normal (fans and harddrive sleep).

Reset the SMC and the PRAM.
Reset the SMC
• Shut down the computer.
• Detach the computer's power cord.
• Press and hold the power button for 5 seconds.
• Release the power button.
• Reattach the computers power cable.
• Turn on the computer.
Reset the PRAM
• (Re)start the computer
• Immediately press & hold the CommandOption+PR keys
• Wait for two startup chimes
• Release the keys and allow the computer to boot.
Dah•veed

IMac display turns off automatically.

Hi everyone!
I have a problem with my iMac. The display automatically turns off while using the computer and I can't continue using it without forcing it going to sleep. The display turns off when the screen brightness is NOT at maximum level. If I reduce the brightness, the screen turns off. If the display it's at the maximum level, no problem, works perfect. No matter if the computer is just turned on from a cold start or if it's running since hours with high temperatures. In System Preferences there's only one option selected in the Enegy Saver section (Allow power button to sleep the computer).
Any ideas? It's really annoying working with this problem (especially at night with the brightness at maximum).
Hope somebody can help me!
(Sorry for my english).

Hi everyone!
I have a problem with my iMac. The display automatically turns off while using the computer and I can't continue using it without forcing it going to sleep. The display turns off when the screen brightness is NOT at maximum level. If I reduce the brightness, the screen turns off. If the display it's at the maximum level, no problem, works perfect. No matter if the computer is just turned on from a cold start or if it's running since hours with high temperatures. In System Preferences there's only one option selected in the Enegy Saver section (Allow power button to sleep the computer).
Any ideas? It's really annoying working with this problem (especially at night with the brightness at maximum).
Hope somebody can help me!
(Sorry for my english).

So, what's the bottom line about these new iMac displays?

My MBP needs repair again, and while waiting for it to be picked up by Apple, fixed and returned I've revived my even older PBG4, running really slowly off an external USB 1 HD.
Since my work depends on using my Mac daily, I was thinking of buying a new computer and using my MBP for a backup.
The prices on the 21.5" and 27" iMacs are good. And they look beautiful when I saw them at Yodobashi Camera in Akihabara. A new 15" or 17" (like I have now) MBP is really too expensive for me right now.
I have had very bad luck with Mac purchases. Almost every one I've ever bought has needed repair - usually as soon as I brought it home. And now I'm reading all these messages about the display problems. Also, the 27" versions seem to have a 2 week delay on orders (though the 21.5" ones are available now.)
If my purpose is to quickly get an affordable Mac this week so I don't have to labor through using this old PBG4 while my MBP is out, are the iMacs ok? Or are the display problems almost universal?
It's sometimes hard to tell since these forums are, after all, a place where people come to discuss problems!
Any opinions?
Thanks,
doug

Thanks for all your replies, people. And hello to you, kguy!
I never even read about broken pixels on the iSight camera. Something else to worry about!
There are some things that bother me greatly about my display and I will argue to the ends of the earth to get an exchange if they happen. The main thing for me is broken pixels. On my MacBook Pro (late 2006) I had 1 bad pixel and it was driving me to distraction and I argued until they exchanged it.
On the other hand, at the same time, LOTS of people were posting about "uneven illumination" problems with their MBP screens and posting lots of photos and there were a lot of threads about it. I suppose if I looked hard enough, after seeing what they were talking about, I could probably see something similar in my MBP screen, but it honestly never bothered me.
But broken pixels truly drive me to distraction.
I haven't seen this "yellowing" thing at any of the floor models at Yodobashi Camera. But it could be because of the comment in this thread about having to look at the display at a severe angle to see.
I've also experienced what kguy has experienced about support in Japan. There is a general reluctance to admit that there is a problem and they will insist that things are "within acceptable range" (to whom?), but then they find some other excuse to actually go ahead and do the repair. It's like they don't want to set a precedent for other people, but they want to resolve the issue and not leave an unhappy customer. If all else fails with Apple Japan you can nicely say, "OK. Thanks. I guess my next step is to talk with the consumer affairs agency." At that point they inevitably say, "Please hold a moment" and come back with a resolution to your problem.
I've had problems, usually out of the box, with every single Mac I have ever purchased except one - my iMac G5 (long since sold at an auction site). Not a broken pixel, not a single problem. I loved that machine, except was upset that it was basically obsoleted 3 weeks after I bought it when they came out with the Intel versions!
Anyway, I might go over to the store and see if I can see this "yellowing" problem people are talking about. Like I said, I didn't notice it before.
doug

New iMac display problem(?) - weird colors and grain

Hello,
I'm a fresh mac user, made the switch this monday (August 27th) when my 24" iMac 2.4GHz C2D arrived. After using it for a while, I noticed a handful of dead pixels, and a semi-bright green stuck one. I thought I'd wait and see how disturbing I would find them before raising an issue about them.
Well, yesterday I decided to make my first backup of the whole system to my external 500GB Lacie drive (connected with FW800) using Super Duper!, which to my understanding is a reasonably sturdy and reliable backup application.
During the first backup iteration I started to notice some alterations in color in the top middle part of the display. I then returned to whatever I was doing (not on the mac, I had no other applications running, just Super Duper!), and after a while took another look at the display. The weird colored area had expanded, and the whole display had become somewhat grainy. Also, the backup process had slowed down quite a bit (from ~30MB/s to ~7-8MB/s).
So I cancelled the backup operation and logged out and back in again. No change. Then I restarted the whole system, which booted just fine, with none of the aforementioned problems. Even the second backup iteration went without problems.
Still, it's a new (and with my budget, quite expensive) computer, and if I get this kind of problem during the first week, I cannot continue using it happily in the fear of these problems reoccurring time and again.
I took a couple of pictures of this, one during and one after the problem. The quality of these are quite lousy, they're taken with my Nokia 9500 Communicator.
During the problem:
http://iki.fi/aita/imac/01notok.jpg
After rebooting:
http://iki.fi/aita/imac/02_ok.jpg
The images are taken in the same light conditions, but from slightly different viewing points. Note: The first image does not present reflections, it's how the screen looked (actually, in real life it looked somewhat worse)
What do you think?
Could this be a driver related issue or have I received bad hardware?
My drivers and Apple software should be up to date (at least OS X informs me that everything is, and I haven't found newer graphics drivers anywhere).
If anyone has had the same or related problems or know how I should proceed with this matter, I would be grateful.
Thank you in advance!
-Aidan from Finland

A few people, myself included, have experienced the same thing. Check these threads: http://discussions.apple.com/thread.jspa?threadID=1082181&tstart=15
http://discussions.apple.com/thread.jspa?threadID=1100912&tstart=30
http://discussions.apple.com/thread.jspa?threadID=1090395&tstart=60
So far the only fix suggested has been to call apple and get a replacement. I'm still.....still waiting for mine to make it slowly across the ocean from China, so I don't know how the new one is working. I'd call Apple and request a new one.

Calibrate New iMac with Glass off?

I have seen that the glass on the iMac is held on by magnets and can be removed very carefully to expose the LCD. This is supported by placing your apple remote on the black border - it will try to stick.
What if you removed the glass, calibrated the screen with a spyder and then replaced tha glass? Would that help anyone? I am currently switching the 20 for the 24 due to the screen but am still wondering this about the 24.

I think you would be better off by calibrating the screen in the dark, which is often done and suggested as the most accurate for calibration. Of course that works best,if you choose the color temputure, and then either have room lights or a viewing box at the same tempurture for complete, critical, evaluation by eyeball.
I know when I use my Spyder pro, and I have to do a calibration with the Ambiant light on, it fisrt measures that light, and then does the screen calibration, but I have a matt screen so there isn't much of reflection problem like the new ones. I would try in in the dark, that's gotten the best results from what I have been able to find on the web. (DP Review has a bit by someone who testetd both 20 and 24 with 3 diferent colrimeters/software packages)

New iMac display on/off

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