IMac display turns to greyscale.

I accidently at one time clicked pop-up menu with two options: Black and white or greyscale, greydcale. The display turned to greyscale. I tried colorsync. I reload OX (at that time full colors came out). Then when the OXreload done, it turns back to greyscale again. Please help.

If your on 10.8 go to: Apple > System Preferences > Accessibility > Display and uncheck Use grayscale.
If your on 10.6 go to: Apple > System Preferences > Universal Access > Display and uncheck Use grayscale.

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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).

IMac display turning off again 10 seconds after system wake

Ever since I've updated my 27" Late 2009 iMac to Lion, I'm observing a strange behavior when waking the machine from sleep:
It wakes up normally, spinning up the harddrive, turning on the display and responding to input just fine.
Then roughly 10 seconds after the wake, the display suddenly falls asleep (turning off) but the machine itself stays awake
I can get the display back on without issue by clicking the trackpad.
This consistently happens when I wake up the iMac.
I usually put it to sleep using the Cmd-Alt-Eject keyboard shortcut. Wake on network is on, so it will have been through a few RTC wake cycles by the time I wake it up from the keyboard.
Is anybody else observing this behavior?

Still happens every day after updating to 10.7.3
Is nobody else seeing this behavior?

IMac Display turns black

Hello,
The display of a friends iMac is going black. After changing the desktops color we saw that there are a few very light white vertical lines. Has anyone had the same problem so can advice us on what action to take ?
Attached a photo from my iphone showing the problem.
The iMac is a 27inch Late 2009 model with i5 processor at 2.66GHz with 6 GB of RAM. Model ID11,1.

You can start by using Mac OS X: Gray screen appears during startup - Apple Support. My advice however is you will likely find it less expensive to have a professional do any repairs. Most do-it-yourselfers in your situation end up realizing this after spending time and money fixing the wrong thing, bricking the machine or never finding the cause however the choice is yours to make. You can also attempt to run Apple's Hardware Test in extended mode 2-3 times back to back, if error codes appear then you know it's hardware however Apple does not publish the codes so finding out what the correct component is can be challenging.
Good luck!

IMac display getting yellow when external display is attached?

Hi,
I have a problem with my IMac (27'' Mid 2010):
I have an external TV attached via MDP->DVI->HDMI cable. When I turn on the TV, the iMac recognizes it and the iMac display turns blue shortly, then the desktop returns and my TV is ready.
What I noticed: After the desktop returns, the iMac sometimes suddenly becomes "more yellow". Don't know exactly how to describe it, but I can clearly see how the desktop returns and then suddenly the imac display turns a little yellow, could also be that the display just gets a little darker (although the display brightness is the same as before). it's nothing that really disturbs me, and although I never saw the color return to normal it does (but I think only after rebooting the iMac)
anything on this? anyone else noticed that?
Message was edited by: nachdenki

Hi nachdenki
I've used both TV's and Monitors with my iMac over the years and that default iMac Profile has always looked yellow in comparison. Try one of those other sRGB, RGB Profiles or create a new Color Profile for the iMac's display.
http://www.computer-darkroom.com/colorsync-display/colorsync_1.htm
Dennis

My 27" iMac displays vertical green lines when turned on and then will not boot up

Can anyone tell me why my 27" iMac displays vertical green lines when it is turned on and then will not boot up?

Welcome to Apple Support Communities
The display or graphic card are damaged. The only thing you can do is to take your computer to an Apple Store or reseller to get your computer repaired.
If you use an external display with your Mac, connect it to your computer and see if these lines appear on the external display. If so, it's a graphic card problem

Is there any way to turn on Video Mirroring if my iMac display is FUBARed?

Okay, my iMac display is permanently frakked.
Nothing else is wrong with the system (the tech assured me, anyways). Haven't yet used Firewire Target Mode to check yet.
Regardless, I have all the proper cables and adapters--and external VGA monitor--but no way (that I know of) to turn video mirroring on.
If I can't get an external display working, I'll be out either $900 to repair the display or $3000 for a completely new system.
Ideas?

Tried it and no go.
Not sure what's wrong.
Connect the VGA cord to the Mini-DVI-to-VGA adapter
Connect to external monitor.
Boot up iMac with adapter attached. Cmd-F1. Nothing.
Boot up iMac with adapter unattached, attach after boot is finished, Cmd-F1. Nothing.
Repeat, using a different USB port for my keyboard. Nothing (x2).
Repeat again, using a third USB port for my keyboard. Nothing (x2).
If I'm not doing anything wrong**, I can only conclude the techie was incorrect and there is something else besides "just the display" that is wrong with the iMac.
**Is the monitor even connected correctly if I continuously get a "no signal" message? Or is that only because the mirroring isn't enabled?

Turn off the iMac display

Can i turn off the iMac display if i want use only external monitor?

Sorry, OS X doesn't allow for that.

Turning imac display off without putting it to sleep questions?

I like to leave my iMac on overnight but I don't want to put it to sleep COMPLETELY. Just to turn off the display. I heard you press control-shift-eject or do a hot spot on screensaver on system pref. But my question is, would it hurt the iMac in the long run for leaving it on overnight so much or it's made to last like that?
I talked to an apple specialist at the local apple store and he said these aluminum imacs are made to last even if you keep them on overnight? But would it overheat over the years? or I shouldn't worry so much. Sorry this is my first iMac. I have so many questions about it.

So it will not overheat no matter what?
If you are playing some 3D action game, or having the computer encode video for one hour straight, it may start to heat up. But then, the fans should kick up to a faster speed (you'll actually hear them), to keep the temp within the acceptable range. If the iMac is just sitting there, waiting for you to do something, it will not overheat. Now... If there is dust blocking airflow, or the Mac has some hardware issue that prevents the fans from running properly, then it is possible for a Mac to overheat, which may cause it to shut down unexpectedly or give you something called a +kernel panic+ (which is basically a system-level crash).
When a computer is running, for most users, it spends most of its time waiting for you to do something. If you are doing something simple like writing an email or web browsing, 90% of the time, it is waiting for you to do the next thing. If you have it doing something like ripping a music CD, during that time, it is working hard to finish as quickly as possible. But since most people do not rip CDs all day, most of the time, the Mac is coasting along, not working very hard. So, there is not much stress on the hardware most of the time it is turned on.
But if you shut down every night and start up every morning, one stressful time for the hardware is at startup. This is because all the components, such as the hard drive spinning up, display turning on, and the rest of the Mac are being powered up, happens at the same time. Waking from sleep is a similar process, and although it is not as bad as a full startup, it may happen much more frequently if the user is sleeping the Mac and waking it up frequently. That's why I suggested using sleep at the end of the day, to save power compared to keeping it ON, but once you have the Mac running at the start of the day, don't have it sleeping and waking numerous times throughout the day; just let it run until you are done for the day, then use sleep until the next day.

Is it possible to "turn off" iMac display (ie. run "headless")?

Hello.
I've replaced my old late-model 2006 iMac (Core2Duo) with a new Mac mini. I'm going to be using the iMac to run Lion server (replacing an old G4 running Leopard server). Since I'm going to be placing the iMac in a server closet and managing it remote (via ARD), I don't need/want the display to be on. Aside from physically disconnecting the iMac display (which I'd rather not do), does anyone know of a way to "turn off" an iMac display?
I know I can do things like run a screen saver of a black image, etc. but that means the iMac is still using the backlight, etc. to display the black image. I know there's no official Apple-supported way to do this, but I'm hoping someone might know of a third-party hack that might work?
Thanks,
Kristin.

Yea, as stated in my question — since I'll be remote managing the box, sleeping the display won't work (as when I remote in, it's considered a mouse movement and the display turns on).
And by disconnecting the monitor, I literally meant disconnecting — in the case of that model iMac, it's simply disconnecting the inverter that powers the backlight. That's what I meant by literally disconnecting the display (and probably what I'll end up doing).
Thanks,
k.

Is it possible to turn off imac display while mirrored display plays video?

I've set up a new 21.5" imac for my parents use in their living room and have connected their 52" lcd tv to the imac as a mirrored display.
One issue that i can't find a solution to is to find a way to turn OFF the imac display when they're watching content on the lcd tv. If they want to watch a film from the imac out to the LCD TV, they want to dim the lights and watch it, but the imac display being on in the dark room is distracting.
Is their any way (3rd party software??) to turn off the imac display while still being able to have the mirrored display running?

You should actually NOT use mirroring, although it would work OK on the 21.5-inch iMac because the screen resolution is identical to 1080p HDTV.
In System Preferences Displays pane Arrangement tab, turn mirroring OFF. This makes the HDTV screen extend the iMac's Desktop. In the diagram on that pane, it shows how the two screen arranged. The edge where they touch is where you can move your mouse cursor from one screen to the other. You can move the two screen around in the diagram, to match how the iMac and HDTV are located in the real world.
In System Preferences Displays pane Display tab, there will be a window for each screen. The 21.5-inch iMac's screen should be set to 1920x1080. The HDTV's screen should be set to 1920x1080 also, if it is a "1080p" HDTV.
To watch video content on the HDTV, first show the video playing in a window. Drag the window to the HDTV screen so that it is completely on that screen. Give the full screen command (usually Command-F). The video will play in full screen mode on the HDTV screen. In most video playing applications, such as DVD Player, QuickTime Player, iTunes, etc., the other screen (the iMac's screen in this case) will go black. It's not OFF, but it will display black.
Note: Some video playing apps have a preference setting for which screen gets the full screen. When playing video content in a browser window (such as YouTube or Hulu), when you go to full screen mode by clicking the +full screen+ button, the other screen will not go black.
As far as I know, there is no way to turn off the iMac display, even with mirroring turned OFF.

I5 27" imac display doesn't turn on

Hi,
This issue just cropped up for me this morning. When I go to turn on my recently purchased (Feb 2011) core i5 27" iMac, the screen doesn't turn on. Instead, it remains black until I hit the power button again, after which it will usually come to life. It sometimes goes black again without any warning. I can usually get the screen to come back to life if I hit the power button. However, I have an older 24" cinema display hooked up as a second monitor, and it always comes to life when I start up, and never goes black like the iMac display. Anyone else having this problem? Are there any known/recommended solutions?
Thanks!

Reset the SMC > Intel-based Macs: Resetting the System Management Controller (SMC)
and zap the PRAM > Resetting your Mac's PRAM and NVRAM
Then if that doesn't help, contact Apple Support or your Local Apple Service Provider. > Apple - Support - iMac - Service FAQ
Dennis

IMac display doesn't turn back on after sleep

This is a new problem on my two-year old iMac, and didn't happen before. What is happening with my iMac is that when it goes to sleep and the display turns off, the display doesn't turn back on when I move the mouse, press the keys or the power button.
It happens only after around 12 hours or so of inactivity, it seems. I have to reboot the iMac to force the display to turn back on. I think it is display issue, not the computer lockup because I checked which logs were written in /var/log - system.log was being written until I rebooted the iMac. However, I didn't see any information in there around the same time that I tried to turn the iMac back on.
Any ideas on how to debug the issue.

Hi dailyjoe
1. Reset your SMC exactly as instructed in the following article:
http://support.apple.com/kb/HT1543
2. It would be normal for you to have to startup your iMac if it lost power while in sleep mode, look at the box "Start up automatically after a power failure" in the Energy Saver preference.
I have always left the box for "Start up automatically after a power failure" unchecked and do occasionally find the iMac is shutdown because the power has gone off. I would suggest leaving the box unchecked, it's better than having the iMac going off & restarting multiple times if you are having bad weather or power issues.
Dennis

Putting iMac display to sleep, when using TV as a screen.

I have just connected my iMac to my 42" Panasonic 1080p TV, the connection was easy and is working fine. My questions relates to putting the iMac display to sleep when using the TV as a monitor, if I am watching You Tube, Sky Player or a DVD, I intend to use my TV as the monitor. Is it possible for the iMac to puts its display to sleep, whilst leaving the TV on. I played around with this today, however was unable to manage this.
Regards Craig

Hi Craig
There is no way to independently sleep either the iMac's Display or an attached Display/TV. However if in the Display Arrangement Preferences you set the attached Display or TV to be the Main Display and turn Mirroring Off, then FrontRow and the Full Screen Mode app's like, DVD player, QuickTimePlayer, etc. will black out the unused iMac display.
Dennis

IMac display turns to greyscale.

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