24" iMac display issues

OK, the display brightness issue exsists. There is some software out there that does help (Gamma Control). So it seems like it can be fixed. Is Apple going to address this issue?
Some people are saying that Apple is catering to the average consumer (watching movies, web, etc.) Is that why they came up with the riduculous glossy displays on their laptops?
Give the graphics professionals some options!
1 Ghz 12 PB w/Superdrive, 24" iMac Mac OS X (10.4.8)
1 Ghz 12 PB w/Superdrive Mac OS X (10.3.5)

Hello Stan
"OK, the brightness issue exsists."
Have you tried this yet?
http://www.splasm.com/products/productbrightness.html
"Give the graphics professionals some options!"
Someone here maybe able to offer more options, what are you looking for?
Dennis
17" iMac Intel Core Duo 1.5GB Ram Mac OS X (10.4.8) Maxtor 300GB FireWire 2G Nano

Similar Messages

IMac display issues / Trying to output at 1920x1080 through VGA

I'm having some external display issues with my 2007 Intel Core 2 Duo iMac (2.4ghz). Using the mini-DVI to VGA adapter, I plugged the VGA cable into a Samsung LCD TV (PC mode). When I originally had everything set up, I was using the TV as an extended display, with a display setting of 1920x1080.
However, I had to get a 25 foot VGA extension cable, and now my maximum resolution is 1600x1200. Does anyone know why extending the VGA cable would do this?

There could be any number of factors involved, but cheap cabling, or that your Mac does not have enough power to push the high quality resolution signal that distance first come to mind.
Dah•veed

IMac display issues: black icons and folders, doubled up files in finder windows, programs won't update

HELP!
I'm hoping someone can help with my iMac 27" purchased in 2010. From a previous discussion I started a year ago, I have had virtually nothing but trouble with it. After the internal hard drive crashing, I was able to install OS X on an external drive and used it for a good 8 months to drive my iMac and I took it to an expert who has replaced it with a 3tb HDD, but at some point the display has gone crazy. I am not certain if it is hardware, i.e. graphics card or video but I'll describe the symptoms and add some pics to see if anyone has seen this before and knows what the problem may be.
1.     90% of the screen was covered with white with just a portion of the desktop showing through.
        (This happened when I tried to reinstall OS X on the old HDD and the new one, but didn't happen when using OS X install disc)
2.     Files, folders, photos and some icons on the dock go black
3.     Files and photos double up when in Finder. When I'm viewing photos, it shows them but all the previous panes and the photos are jumbled behind the
        photos.
4.     Anything I open in Preview is completely black, but ColourSync Utility opens everything fine.
5.     Programs won't update. They will download onto my iMac but won't update. Some say, because I don't have OS X 10.6.8 others just won't open.
        Including Google Chrome, opens with two tabs open but when I open a third tab the rainbow wheel just turns. Skype won't open just gives a failure
        report.
6.     10.6.8 Update Combo downloads but when I restart the screen is covered in white - as in 1. and I have to reinstall OS X 10.6.2 to get the screen to               clear but then all the above problems continue.
7.     Sometimes videos don't display in Youtube, or the entire page other than the video player is covered in rainbow lines.
8.     Some buttons are blacked out on selection pages, i.e. system preferences, or saving screens
9.     Photos opened in FB go upside down and flicker all over the page as my mouse runs over them.
10.   Photos won't upload into internet editing programs.
I can't find anyone who has had the same issue in all of the discussions I've looked at, but it sounds like I have a video problem, but I wondered if it might be a software problem with flash or something. Or I have something malicious on my computer.
I also have an iphone 5 that faulted with the iTunes and USB icons and won't fix after trying one of those R-Sims, and I wondered if somewhere along the line it may have even had a virus/trojan/malware that has infected my external drive and then my internal drive. A reason I have thought that is because I have used my daughter's MacPro laptop and plugged in my external drive and I noticed the windows in hers were starting to do the same thing.
And on top of all that, my fans didn't work for over a year and I had to place an external fan at the back of the computer or it would overheat and shut down, but after resetting the SMU it started working again, but it is very noisy. I have tried to download SMC Fan Control and although it downloads to the HDD, it won't open.
Sorry its such a long post, I do hope with all of this information someone can help me.
Thanks so much.

HI and Welcome to Apple Discussions...
*Soon after, I installed Quake Wars, L4D 1, 2, Mass Effect 2, Need For Speed: Undercover, Mozilla Firefox and *Sophos Enterprise AV*. Approximately a week after installation, I began to experience malfunctions varying greatly*
Macs get grumpy when running anti virus software. Disable or completely uninstall Sophos A/V and see if that makes a difference. A/V software on a Mac will slow the drive down more and more as time goes on.
Also, check the vendor sites for each 3rd party software you installed to make sure they are compatible with 10.6.x
The "hard reboots" are a result of the system freezing due to incompatible or outdated software.
Carolyn
Message was edited by: Carolyn Samit

IMac Display Issues Not Resolved

The Apple Store at La Cantera in San Antonio Needs Help!
I purchased my first personal iMac on May 17, 2006. It was a reconditioned model. Granted, I work for a very large urban school district in technology, I decided that the Intel Mac was for me. Within ten minutes of receiveing my iMac from Fed-ex the display began to show pinkish and green pixels all over the screen. I took the unit in that day to the Apple "Geniuses" at my local store. They booted it and immediately ordered a new MLB and LCD. I was told by the Apple support site it would be ready the 23rd of May. The day came and went and no iMac. On the 25th the store now reported that they were waiting on a Bluetooth Chip that they had broken during my repair. So, I was forced to wait over the Memorial Day weekend and finally received my iMac today. After ten minutes of use, I noticed the same exact problem I took it in for. It was as if no one had repaired it! I checked my System Profiler and noticed that my one gig stick of ram had been replaced by two sticks of 256MB of RAM! Wow! Where did my RAM go? The manager said he trusted the integrity of his techs. Does that mean he doesn't trust mine? Sadly, I am returning my iMac and will probably never make the Switch. I really wanted to. But, Apple is just not ready to please their customers.

How is it going on?

Repeated iMac Problems, Display Issues now Kernel Panics

I’m lost on what’s wrong with my 2008 iMac and I think I just have to bring it back into Apple for a third time to have it repaired. But something is obviously not working that is causing these issues.
About a month ago, my computer began showing heavy pixilation, flickering images and the on-screen graphics. The computer appeared to keep working in the background from what I could tell so I came to conclusion that it must be the graphics card that’s failing and I’ll need to have it looked at.
My 2008 iMac was custom-built by Apple with the Nvidia GeForce 8800GS that was offered as an upgrade option. There have been several posts on the display and graphics discussion board about that graphics card along with other postings other places about the problems the Nvidia GeForce 8-series had.
The display problems I mention above would not happen immediately, it would happen as the computer warmed up and was used for 3-5 minutes.
Anyway I brought my computer into Apple explained to them what I believed was the problem and the Apple Store technician agreed with me. Because I did not purchase AppleCare, it cost me $400 and a week without my iMac to have that card replaced.
I got the computer back two weeks ago and everything seemed fine. It was working as it always had. I even was running SMC Fan Control in order to keep the computer as cool as I could (the Nvidia problem was related to overheating).
But this morning, this is what I woke up to:
http://img97.imageshack.us/img97/7436/photoijr.jpg
The computer now has a semi-permanent pixilation when it starts up (as suppose to the pixilation 3-5 minutes into use). But more worrisome now is I cannot start up the computer without it going into a kernel panic. I tried resetting the PRAM, I tried starting in safe mode. The only thing I haven’t tried yet is booting from an external HD which I will try this evening (to hopefully isolate it if it’s hardware or a software problem).
The Apple Hardware Test has been unhelpful. When it originally failed three weeks ago, the test showed nothing and this morning when I ran it (permanent pixilation and all), it showed nothing. I feel like if it was a software issue the pixilation would have disappeared during the hardware test because that’s not an OS-X based program.
Here are my specs on this computer:
2008 iMac 24" 2.8ghz Intel Core Duo, 4 gigs of RAM (Crucial Purchased, I have original sticks somewhere), 1 TB HD, Nvidia GeForce 8800GS.

Hi, just to update you, I came home today and did a few things that didn't seem to solve my Mac's problems:
- I booted up from my firewire "safe" drive that I keep a copy os x on to see if I had a corrupted hard drive or something. It booted into the kernel panic I described above.
- I also swapped out the crucial RAM for Apple's factory RAM. It also booted into the Kernel Panic.
In both incidents, the display issues didn't go away. Now instead of pixelization i have vertical bars running in a pattern across my screen.
I'm currently trying to boot onto the OS X CD at this point to see if I could do a reinstall. It's taking quite awhile to boot into that.
With that in mind, I think we're still having graphics card issues or more seriously some logic board problem.

Anyone experienced dust issues yet on the newest 27'' 2013 Imac (display) ?

Hello,
I just ordered the newest Imac 27'' from the store and was very happy and excited at first but it slowly faded as i read on about the display issues which seemed quite common on the previous imacs (dust inside the imac, panel removal etc.) and now i'm torn between sending it straight back or keeping it.
I bought this imac with the intention to last at least 4-5 years but after reading through all the messages i'm not sure about the quality of this apple product anymore - sadly.
I also have to say that i am still an university student who can't afford switching panels all the time (no apple care) when i know it only helps out temporarly and the main problem probably lies somewhere deep inside the imac.
So any information or experience regarding the dust development within new imacs would be helpful thank you !

after reading through all the messages i'm not sure about the quality of this apple product anymore - sadly.
You should keep in mind that these are technical support forums. Generally, the only people posting here are those with problems. The thousands/millions without problems don't ever come here. Think of this place as an emergency room/hospital for comps. If you want to a review of your model iMac, do a Google search for news articles rather than a "technical support" message board. Read all the reviews you find.
Since you are a student, you are entitled for a student discount on AC. You were also entitled to one on your new iMac too. Did you get it?

Intel imac display glitch and involuntary restart

Just want to know if anyone else has experienced this specific problem, there are plenty of complaints about intel imac displays but I can't be bothered to sift through them all trying to find a match for my problem.
A couple of months ago I was watching a video in quicktime and noticed that my screen was glitching and flashing fragmented diagonal lines - like a commodore 64 loading type thing. Then the spinning-ball came up and a force quit didn't do anything so I had to force shut down. I started up and it occured again. Then the screen went blank/black, but still lit up, and restarted without me doing anything. It also got stuck during start up the second time this occured. I panicked and ran out to buy a 500GB external drive, backed up all of my work and then re-installed mac osx from disk, archive and install job. This seemed to sort it and for the following two months it seemed OK. No sign of any problems.
Since then I have updated from 10.4.7 to 10.4.10 (which I have suspicion that it screwed the firmware in my motu 828 firewire audio interface, costing me a £130 repair - but that's another painful story).
It happened again tonight (the screen thing, not the motu). And the ball came up and I couldn't do anything. Force shut down, restart - screen glitching again. Then I had 2 unexpected restarts, one getting stuck in startup. Then a successful startup but accompanied by the glitchy graphics, mainly red/pink pixellated diagonal lines flickering in and out. I ran a disk first aid - no problems. Did a disk permission repair. Shut down and ran a hardware test, the first few minutes of the test the screen was still at it but then stopped glitching, hardware test found no errors (it was an extended test too). Now I'm back on it and it's all OK.
Any suggestions/similar stories?
When it occured 2 months ago I had the original ram that came with the imac. Now I have 2x1GB sticks of crucial ram.

That's it! Well, that's what I have. Unfortunately, I don't know about the cause, but I don't ever recall having it prior to an update going back about a year ago. I recall an update, and that update being immediately followed by some sort of Apple Graphics something-or-other. I feel pretty certain that's when I first noticed this. I just had my LCD replaced for another reason, but I think you'll agree, it's not an LCD issue. In my case, browser activity, scrolling up or down in a page, seems to be the most common trigger. I've also seen "pieces" of the torn page, on the screen when minimizing the browser to the dock (usually Firefox, but I think I've seen it with Opera and Safari too). Is there a way to find update packages installed somewhere? I'd know it if I saw it, and I'd definitely try removing that suspect package/update.
Message was edited by: geekboy2000 - corrected OS

IMac - Display doesn´t work after restart

My iMac 21 Display doesn´t work after restart. If I turn it off and 1 hour later I want use it again the iMac shows the white screen with the mac logo and then the display goes off. I connected an external display to check if the iMac was ON and with the external display I can login and do everything but the iMac Display doesn´t work .
If I turn it off and wait 3 or 4 hours and then turn it back on the display works OK.
This is very strange behavior I have spent hours and hours trying to fine the solution or a similar issue but nothing so I am looking help here at apple.com
BTW When I bougth the iMac 21 there were some spots over the display so the display was replaced by the provider. The warranty has expired by now.

To tell you the truth, I don't know if they have to repalce the LCD panel or what they do for a bad backlight. In this reality of block or assembly replacement it probably involves repalcing the panel and not the backlight component. Don't know what it would cost. You'd have to ask that of a service center.

Apples update didn't work for me: Boot Camp: iMac displays a black screen during installation of Windows 7

Boot Camp: iMac displays a black screen during installation of Windows 7 - Apple Support
I have followed each of the steps listed in the link above with no success.
Prior to adding the extra drivers I was able to start the Windows install process up to reformatting the "Windows" Bootcamp drive. After that the computer would go through some instal processes and eventually restart. After the restart the screen would go black. The black screen lead me to the Apple Support link above dated March 5 2015. After going through steps listed in the link above, I get an error message stating that the D:\Sources\instal.win. file cannot be located. I am forced to restart the computer at that point and theWindows install process attempts to start again but always ends up at the same point.
Note: I am installing windows 7 Pro from a DVD. I scanned the AutoUnattend.xml file and noticed that it refers to "Windows 7 ULTIMATE" but not "Pro" or any others that I could see. (see below). Could that be part of the issue?
Any feedback would be greatly appreciated.
<cpi:offlineImage cpi:source="wim:d:/sources/install.wim#Windows 7 ULTIMATE" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
</unattend>
iMac (27-inch, Late 2009)
2.66 GHz Intel Core i5
16 GB 1067 MHz DDR3
ATI Radeon HD 4850 512 MB

Here is an over-simplified explanation of WIM and CLG files. Assume your DVD Media contains
W7- Ultimate
W7- Professional
W7- Home Premium
W7- Home Basic
WIM Files
File1
y
y
y
y
File2
y
y
y
y
File3
y
File4
y
y
File4
y
y
y
The File .wim will contains a compressed image which contains File [1...5].
The W7-Ultimate .clg will have 5 entries, with all set to 'Y'.
The W7-Professional .clg will have 5 entries, with 'Y','Y','N','Y','Y'.
The W7-Home Premium .clg will have 5 entries, with 'Y','Y','N','N','Y'.
The W7-Home Basic .clg file will have 5 entries, with 'Y','Y','N','N','N'.
This allows a single .wim Image file on the DVD media to be used to install any of the 5 flavors of Windows. When you enter your product key, the Installer knows what specific W7 variant you have the key for and will tell the WIM to extract the specific files the installer needs to be extracted.
The following line
<cpi:offlineImage cpi:source="wim:d:/sources/install.wim#Windows 7 ULTIMATE" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
is telling that a retail product key will be entered, which should go look for this specific .clg file (from the five you already have on disk). You can test if it will work for you by changing this line to the following
<cpi:offlineImage cpi:source="wim:d:/sources/install.wim#Windows 7 PROFESSIONAL" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
If it does not work, the other issue can be related to device discovery. Typically A: and B: device names are reserved for Floppy Drives. C: is your internal HDD.
D: can either point to the Optical drive, or the USB. The normal convention is that the removable media is named from Z: backwards. Y: and Z: are usually used for Network drives, so X: should be your USB. First try with the change to "Professional". If it does not work,

Another iMac Freezing Issue - pls help a newbie out

I understand this problem is not uncommon - I've been trying to read the many threads I see on the issue. However, most posts outline problems, suggestions are made, but then reported to not work. Also, many threads are 2 years old.
Could someone please suggest a step-by-step troubleshooting solution?
Here are my pertinent facts:
* Bought 20" iMac in July 07.
* Processor: 2.16 GHz Intel Core 2 Duo
* Memory: 3GB 667 MHz DDR2 SDRAM
* Hubs installed the second memory stick a while ago (over a year and i don't remember this problem correlating with the new memory).
* Video: ATI Radeon X1600
* OS: Mac OS X 10.6.2
* HD: 250GB capacity, 31GB available
* I am using an external harddrive to back up my stuff (LaCie, connected by firewire)
* Frequently used apps: Firefox, iPhoto, Photoshop Elements, Parallels (Quicken for PC), MS Office for Mac, etc.
The problem starting occurring several months ago, while I was still running Tiger. Have since upgraded to Snow Leopard, with no improvement, in fact, things are getting worse.
I get display distortion ("artifacts"?) - horizontal lines, blocks of the screen distort, usually clearing after dragging that part of the app off the screen of view and then back.
Typically, if I start seeing display issues, a freeze up is imminent.
Sometimes I get a sense it's coming soon - things run more slowly. Other times, it seems without provocation. I click on a window and nothing happens.
Sometimes it's the wheel of death other times screen completely locks up with no spinning wheel. No option to force quit. Mouse is unresponsive. Keyboard appears to be, although I can toggle the Caps lock button on and off (light toggles). If I am streaming video, the screen will lock up, but the audio continues. If I wait (have gone to bed and come back in the am) it is still frozen.
If I am streaming video (i.e Hulu on Firefox) or working in memory intensive applications (Windows, Parallels, Photoshop Elements, etc.) Problem is more frequent.
I can go a day or so without problems, but if I am doing anything slightly involved, it happens much more frequently, as often as every 10 minutes or half hour or so.
Steps I have taken:
I always have to do a hard reboot. I have run disk utility multiple times, occasionally it finds and corrects stuff, but no fix seems to be permanent.
I have seen suggestions of resetting PRAM as well as doing a clean re-install, but also seen that those fixes haven't endured.
I don't have Apple Care and I'm not sure what steps I should be taking to fix this. Is there hope? I mostly see lots of problems reported, but not successful resolution.
It's aggravating because I can't use the system for the stuff I bought it for (ex: digital scrapbooking) without worrying about losing my data. I switched to a Mac because I heard they ran so great and were "cool" to boot. While there have been many features of the Mac i enjoy, *if this kind of performance is typical after 2 yrs of use, I will not remain loyal to Apple.*
If you have been successful in resolving the issue with Apple, what did you tell them and what did they do?
I am competent system "user", but not as good when it gets into the weeds. Would appreciate any advice, feel free to spell it out as tho I were an idiot.
I would appreciate a "try this, then try this" approach, especially if you have tried it and it has worked for you.
Thanks for the help,
Kendra

OK, Mean, I mean Meanest, we have the same system (mine was purchased late 2006), and I can say we have identical symptoms. I agree with Paul_31 regarding disk space, but in addition, from all the posts on various Apple forums, it seems clear that the problem is due to the Radeon X1600 graphics card AND heat. These elegantly-designed Macs that we all love have a lot of stuff packed into a small package. Consequently they run hot, and over time the result is components bake and deteriorate. In our case, the weak link seems to be the Radeon card and since it’s not easily replaced, repair costs are nearly as much as the cost of a new iMac. A contributing factor is that over time dust will build up inside your Mac, and this serves as insulation, retarding heat transfer, and causing components to run hotter still.
OK, so that’s the sad tale, but what can you do? Assuming your system is not too far gone due to the ravages of heat over time, there are things you can do to help prolong it’s life, and hopefully get it to behave itself better until the time it finally fails completely.
In my case, the steps I’ve taken have resulted in a system that now “generally” runs for days at a time without locking up/crashing. A caveat: these are bandaids, not true fixes. I’m convinced the Radeon card will eventually fail and I’ll be faced with shopping for a new Mac – I’m only hoping the steps taken will give me a few more years of use before that happens. So, here’s my suggestions (basically they all have to do with getting your Mac to run cooler and being able to monitor temps so you know just how hot things are getting):
1. First of all, if you don’t already have one, get one of the free programs available to monitor your Mac’s internal temperatures. One of the most popular ones is a widget, iStat Pro. As I type this iStat Pro is showing my temps are as follows:
Hard Drive 92 deg. F
CPU 85 F
Ambient Air 69 F
GPU Diode (graphics card) 92 F
Hard Drive Bay 95 F
Memory Controller 90 F
Optical Drive 81 F
If you have iStat Pro and see that your temps are about the same as these, I would say don’t bother to read further – you may have a different set of problems. If your temps are 10-20 F (or more) higher, keep reading.
2. Try to clean out the internals of your Mac with compressed air. After 3+ years of use, I used an air compressor with an air gun attachment and blew through the vents at the back and bottom of my Mac with 60-80psi and actually saw a cloud of dust come out of my Mac. A more effective approach would entail cracking open the case of the Mac so you could really blow directly on the different boards/components. I haven’t done that, but I’m tempted to give it a try. Note: Some have suggested vacuuming and/or using a can of compressed air. I don’t think that approach is all that effective. You need a really strong flow of air to get that dust out of the inards.
3. Download the free program SMC Fan Control (v 2.2.2). It will allow you to adjust the fan speeds higher for each of the 3 internal fans. The Mac has firmware that ramps up the speeds of these fans as internal temps rise, but the general consensus is the Mac firmware is “too little, too late”. With the standard Mac firmware, the fans will run at their default settings well beyond the point where the components are already way too hot. SMC Fan Control allows you to set the minimum fan speeds higher than the Mac default.
Once you've done these steps, I'd suggest doing a SMC reset, then re-boot while keeping your fingers crossed.
This is getting too long so I’ll stop for now. Good luck...

Weird OSX display issues after going to webpage, only thing that fixes is Perm repair

I have a bizarre issue that i'd love some input on. Late 2009 iMac, Mountain Lion (then Mavericks).
I use Firefox to utilize a real estate website (Fusion MLS) for several months now. A couple of days ago, after i would log into the website and use it for a little bit, the rest of my tabs, apps, windows, would all start appearing as black boxes, or have glitched out (generally black) screen display issues. To be clear, other tabs inside the browser would be black, or partially black, and also the right half of my taskbar icons would be black silhouettes of the icon. BUT, the Fusion MLS website would still work fine. Closing the page, etc, would not fix the problem, it would be stuck like that no matter what i closed or opened, computer would function fine except for the display, but i couldnt see hardly any of the apps so I'd have to shutdown, but a simple reboot didnt fix it. After an hour of troubleshooting, I started off in Mountain Lion when the problem appeared, and in the process of troubleshooting I decided to upgrade to Mavericks to see if that would fix the problem, it didnt. Ultimately I discovered the only thing that fixes the problem is to boot into Safe Mode and Repair Permissions, then i can come back in as normal and everything is normal again (a standard reboot doesnt fix it, when logging back into OSX it would still have black silhouettes and all the app windows would be black).
So after the above I decided to just start using a different browser to go to this Fusion MLS website (Safari). Which worked fine for a day, but now when i go to the website, i have no problems, but when i put the computer to sleep, and bring it back, the windows are blacked out and icons silhouetted. So back to safe mode, repair perms, and then it works again. When i do the repair perms, there are usually no verbose things that it says it repairs, sometimes it says something about the PrinterList being 0 instead of 80, but thats it.
Any help or insight would be greatly appreciated, I'm completely dumbfounded....

Now regular Repair Perms doesnt fix it, it has to be Diskwarriors Repair Perms. Also it happens anytime the computer is put to sleep for a length of time and brought back, regardless of whether the Fusion MLS website was gone to.

Audio and "multiple display" issues in Lion

Hi Guys
Since I installed Lion, I have the following issues:
DTS and 5.1 does not seem to be going out to my receiver. It worked with VLC and XBMC, now it only works with XBMC and no other player.
So if I try to use VLC I can move it over from the main desktop to my HD TV, but no DTS.
If I use XBMC i get full DTS but have no way of ruuning it on the HDTV because the multiple display options are gone from preferances!!!
I used to be able to turn off the 27 imac display and use the HDTV display, cant do that anymore.
Also the magic mouse now has a life of its own and jumps around for no good reason and sometimes dissapears all together.
Any help would be great. Seems to me like this "upgrade" is not much of one...
Instead of more usability, I now have way less.

Hi Andyjw
Assuming your machine has been behaving well for some time and this is just happening now suggests to me it's going to be bad news for you.
Before you take it to the repairers however, have you tried unplugging your iMac from the wall socket, waiting for, say, 10 minutes then plugging it back in again?
This is in addition to all the usual checks of course such as repairing permissions and so on.
Also, on one of your 'System' discs there should be an app called *Apple Hardware Test*. Have you tried that to see if it comes up with anything? I think you might have to boot from your System Disk to run Apple Hardware Test but I'm not certain about that.
Good Luck

27" imac display acting as two displays

Can seem to find the answer to this, results lead to howtos on a dual monitor setup.
I'd like to know if I get a 27" imac can I have the monitor act as a dual screen setup. Essentially, I would like my windows to load and act the way they do given my dual screen setup that I currently have with my macbook pro.
I know I can resize windows and get it to mimic a dual monitor setup, sort of, but I'm trying to avoid this every time I open something new.
Does anyone know if is this is something that I can do easily with expose and spaces?
Thanks

Welcome to the Apple Discussions!
If I understand your question correctly then yes, the iMac display can be toggled back and forth between the two computers with F2. When the iMac's display is being used by the PC it is in Target Display Mode. The issue is that the iMac can only use mini-DisplayPort input from an external video source. So you would need a PC with m-DP output or a very expensive converter to convert your PC's current video output to m-DP. Then you connect the converter to the iMac with a simple m-DP to m-DP cable. These converters which are fairly new start at about US$150.
Dah•veed

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...

2010 imac display went black, but hard drive still working

Does anyone have an idea as to why the screen is black? Was on it about an hour ago with no problem. Have turned it off and back on, can hear it, but no matter what screen stays black.

Lolo55,
Thank you for visiting Apple Support Communities.
I understand that your iMac display shows a blank screen. Here is the best troubleshooting resource to go through when experiencing these symptoms.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT201177
Cheers,
Jason H.

24" iMac display issues

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