Do I need to calibrate my iMac screen

Do I need to calibrate my IMac 27inch screen, if so how?

If you are a home user, you don't need to calibrate your screen, as it's precalibrated. If you want to calibrate it, you can do it in System Preferences > Displays > Color > Calibrate

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I need to connect my Imac 27'' (newest version) up to 3/4 monitors (all 40'' LCD tv's with VGA and HDMI connections) with extended display to all external screens, not duplicate images. Is this possible?

i need to connect my Imac 27'' (newest version) up to 3/4 monitors (all 40'' LCD tv's with VGA and HDMI connections) with extended display to all external screens, not duplicate images. Is this possible?

I would suggest you visit an Apple dealer, preferably an Apple Store if there's one in your city, and ask for assistance in determining what you need. The questions and issues you bring up are rather complex to address in a technical support forum and would be better addressed in person where you and the salesperson can ask questions back and forth to arrive at the optimal setup.
Regards.

Why do i need to restart my imac everyday like ten times to get it to work, also the screen displays little digital squares.

Why do i need to restart my imac everyday like ten times to get it to work, also the screen displays little digital squares.

Hi Matt,
I purchased my imac in November of 2010 and below is a cut and past from Hardware overview. It has 1 TB hardrive, with 670 GB free. When i start up in the morning, it boots normal then freezes. Half the time i can get it to restart before it freezes, other half i have to power down then restart. At the same time throughout this process the little pixel squares show up sometimes in a single line or two aross the screen, then sometimes more random. After about 7 times of rebooting, everything runs fine for the day with no weird pixels. then i shut down at night, and start the porcess over in the morning. Thanks for your help!
iMac
Model Identifier:
iMac11,3
Processor Name:
Intel Core i5
Processor Speed:
2.8 GHz
Number Of Processors:
1
Total Number Of Cores:
4
L2 Cache (per core):
256 KB
L3 Cache:
8 MB
Memory:
4 GB
Processor Interconnect Speed:
4.8 GT/s
Boot ROM Version:
IM112.0057.B00
SMC Version (system):
1.59f2
Serial Number (system):
Hardware UUID:
AF510593-DDA2-513F-AE18-631B726F0BB1

Hey, I broke my iPhone 4 screen when I change it my phone start to turn off while my battery reach the 25% when I connect it to the charger it switched on, and the battery percentage is around 25% so it's the time for a new battery, or I need to calibrate

hey, I broke my iPhone 4 screen when I change it my phone start to turn off while my battery reach the 25% when I connect it to the charger it switched on, and the battery percentage is around 25% so it's the time for a new battery, or I need to calibrate it? thank you

There are no user serviceable parts in an iPhone. Since you
made an unauthorized repair to your iPhone, you will have to
seek assistance elsewhere.
Google or ifixit.com may provide some direction, but you can
get no help here per Terms of Service. Sorry to tell you this,
but it is what it is.

Calibrating 24" IMac screen

Hi. I am just switching over from Windows to Mac so please be patient with this question. I am trying to calibrate my monitor using spyder 2 pro. In the setup I have t choose between brightness, contrast, or backlight. problem 1. Next I have to chose color sliders or Kelvin preset sliders. I don't want to be too much of an idiot but I can't find this info. All I see is the one F1/F2 control.
In my digging today I did see where the monitor can be set for all color spaces from a pull down list. Are these monitors that good that they never need recalibrated...do I just pick the space and throw away my Spyder?
Oh, and I tried the 'advanced' by eye option of color calibrating, making the apple match the background, and would prefer a more effective way. My eyes started playing tricks on me.
Thanks.

Hi, I just calibrate mine for the first time with Spyder 3 Pro so I know a little:
It's better if you start all over again, in case the preferences are set wrong:
1. Click in Go and select Display, you have to choose that you own an LCD screen.
2. Select that brightness (F1 and F2) Note: I set my brightness just on the 5th bar from the left to the right
3. Then after you select it, Spyder should give you some values like Gamma and White Point, I've them as Gamma 2.2 and White Point 6500 K. If the results you have are different, try changing them choosing the option "change this settings"
3a. if you are changing the settings in the target window you could to choose 2.2-6500 or the target you want.
4. Once you are agree with the targets you have to click next and set gray balance calibration "on"
5. on the next screen is ask to choose if you want the ambient light compensation on or off. I choose off, because every time I choose on I had a problem with the luminosity, because the iMac screens have this luminosity problem and they reflect so much light, therefore either you choose off and thats it or you choose on.
5a. if you choose on, you have to control the environment light, e.g. close your binds or turn off the light, etc. Do this until you get a "Moderately Low" value, which is the best value for editing pictures.
6. the next steps are easy, just follow the on-screen steps and voilà!!
Note: do not change the icc settings (preferences>advance settings) leave the value in 2.0 because the iMac wont recognize the 4.0 icc file.

My ipad recognizes my home network but will not connect to the internet. When I click on AirPort/preferences at the top of the imac screen it says..."AirPort has a self-assigned ip address and may not connect to the internet".How can I change ip address?

My ipad recognizes my home network but will not connect to the internet. When I click on AirPort/preferences at the top of the imac screen it says..."AirPort has a self-assigned ip address and may not connect to the internet". If this is the root of the problem,how can I change ip address?
Ipad will connect no problem to other networks.

First thing you need I think is to get your iMac connected to the Internet.
Shut down your iMac and you iPad. Then power off your router. Wait 30 seconds and power up the router.
After the router indicates that it is connected to the Internet then start up your iMac and see if it connects. If the iMac connects to the Internet then your iPad should too.
If this power up sequence doesn't work you'll have to dig into the router setup to make sure it is working properly.

Any external monitors as good as imac screen for text?

hi all.
this is my first mac. it's a new 21.5inch imac with a 2.7ghz i5 proc running OS X 10.7.3 and 12 Gigs of RAM (8 Gigs from crucial for $50, who can resist?)
i've got it hooked up to an external samsung syncmaster B2330 running in 1920x1080, which is this monitor's native resolution. works fine. it's hooked up via the dvi port on the screen via the mini-displayport to dvi adapter for the mac. i switch this monitor to the vga port when i want to use it as my pc monitor also running at 1920x1080. there is a source button on the monitor. very convenient.
the issue is that they text on this screen when coming from the mac is not as clear was when coming from the pc despite the fact that the vga port provides much less bandwidth than the dvi port the mac uses. i've read that the mac and the pc display text on screen using different methods. my pc uses an nvidia display graphics card. i believe mac use ati based hardware.
there appears to be much more interpolation when displaying text from the mac. perhaps this is a text size issue i'm not sure. either way i read a lot on this monitor and need it to be as good as possible for that purpose.
so the question is, does anyone have experience with an external monitor that is as good as the imac screen for text display. i can't use the thuderbolt display or a cinema display since they don't switch to different ports allowing my to use a single external monitor for two machines. i'm willing to spend up if there is a reason to do so. i'm on these computers a lot. i work from home with some regularity and my job is all about reading.
any help is appreciated.
best, c

I have an dell 24" lcd as 2ed monitor and text look as clear as the imacs screen
but it having a t-nfilm lcd panel vs. the imacs ips panel the colour and contast look worse
but text look as clear
and it look the same when I boot up in win7 using bootcamp

How to keep iMac screen black while keeping secondary monitor running for visual experiments in Matlab

Hi,
I'm trying to run a visual experiment using PsychToolbox in Matlab.
I've attached a secondary monitor to my iMac for this purpose and I'm having difficulties trying to
'black out' the iMac screen.
I need the secondary monitor to run at a refresh rate of 120Hz and at linearised luminance (did this for my secondary monitor),
so I can't really use my iMac screen. However, i need my iMac screen to be darken out because I'm doing a vision experiment.
I tried dimming my iMac screen but it doesn't go completely dark. I tried Ctrl+Shift+Eject (or was it Command) but it will darken both
monitors. I also tried mirroring, but it doesn't seem to work too.
I'm really stuck and any ideas will be greatly appreciated!
shui
NB:I'm using OS X Version 10.8.3.

I do not know the details of your experiment, but creating a black monitor is not difficult. For example a completely black page, e.g. in Power Point, set to fill the screen?
The advantage of doing this with PP is that you can move in to or out of the black page with just the space bar. You can set up your monitors so PP is displayed on just one monitor.

24" 2008 iMac screen going black

My 24" 2008 iMac screen keeps going black then coming back after a while. What temperature would it need to get to in order to knock out the display? I have iStat.
Also, if the screen fails due to graphics card or other component, is it possible to connect an external display to use it until I can upgrade to a mini?
Cheers.

As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
You are now in a perfect position to do a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
It is the 5 second timing that initiates the reset.

IMAC screen dead.. Switch to external monitor?

Mu son's iMac has a dead screen. Black after startup... The computer is running, but he needs to switch the startup screen to the external monitor so he can make any additional backups he needs before chucking it into the garbage. Actually, it is under warranty, but he has files that need to come off it.
SOOOO, is the a keyboard shortcut to switch the monitors???
Help.

HI Mike,
you could try command command + f1 (the key next to escape)
if that dose not work try fn + command + f1.
Alternatively if you have another mac and a firewire cable. you could plug the imac into your other mac, and boot the iMac into Firewire target disk mode; and copy the files to the other computer. Firewire disk mode makes your imac act like it's an external hard drive.
-tt

My iMac screen is blue?

My iMac screen is blue? What can I do?? Please help!!

You can try repairing it but you will need to do so from either the original Install Disc that came with the computer or the Snow Leopard Retail disc. How you do that is insert the disc in the SuperDrive restart while holding down the Option Key and then select the disc. Choose the language, then click the Utilities Menu - Disk Utility and run Repair Disk. If it finds errors run the utility several time until it comes back error free. Then exit Disk Utility - Exit the Install process and try to restart normally. Obviously if it won't repair the HD has already crashed and needs to be replaced.
If you can get the machine to restart then BACKUP IMMEDIATELY!!!!!! if you didn't already backup. Once it is backed up then you can try to operate the machine. However IMHO your HD has either crashed or is getting ready to and you should be prepared to replace it.

If i tap somewhere on my Ipod touch 5 then it will tap somewhere completely different or even if i dont tap anything it will tap something anyways. Do i need to calibrate it somehow or what?

If i tap somewhere on my Ipod touch 5 then it will tap somewhere completely different or even if i dont tap anything it will tap something anyways. Do i need to calibrate it somehow or what?

There is no calibaration.
Make sure the screen is clean
Try:
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Restore from backup. See:
iOS: Back up and restore your iOS device with iCloud or iTunes
- Restore to factory settings/new iOS device.
If still problem, make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
Apple Retail Store - Genius Bar

IMac screen suddenly oversaturated. ML. Redish-magenta colors

I have my osx system since 2007. i recently upgraded to imac 2012, 21.5" and Mountain Lion (from imac 2007, snow leopard). I do professional photography.
Everything was fine until i notice that in some photos, my magenta-redishh colors were way to saturated. I DO food photography, speccially salmon and this particular salmon hue is very very saturated now.
Also i notice an increased "GAMMA" compared to my previous monitor, but i was expecting that on new imacs. Any way, this gamma enhancement increases overall contrast too making everything worst.
Tried to change the monitor profile (i´m using thedefault by now) and nothing changes. Is very annoying not having fine control over the iMac screen. The visual callibration method is very unreliable. I did not touch the "universal acces" contrast either, that is not the issue.
I´ll try to load in safe mode, maybe is there a nvidia CUDA driver error?
Please i need help .i´m afraid is a hardware issue.
thanks.

I downloaded the whacked rgb image and it looks ok for me. on every app. a little oversaturated overall
only color-managed apps will display whackedRGB correctly -- it will look blue on unmanaged apps
if it is still showing a little oversaturated in Preview, Photoshop, Safari -- then your monitor profile doesn't quite match your monitor
you might try using a fresh sRGB profile as your monitor profile (if that improves the WhackedRGB color) until you get the calibration figured out
untagged and adobe rgb look more saturated on orange-magenta hue.
untagged RGB on unmanaged apps generally gets sent straight to the monitor with no change
you can test this in Photoshop by View> Proof Setup: Monitor RGB
untagged RGB on color-managed apps (Safari, Preview) generally gets sent straight to the monitor with no change
untagged RGB on Photoshop (you ignore the embedded profile or don't color manage) and Firefox (with Full Color Management Value 1 enabled), for all practical purposes, ASSIGNS the working default profile and CONVERTS to monitor RGB

My old iMac (screen sits on a white dome) opens with a tiny folder that flashes a question mark, instead of a login to user's desktop

My old iMac (screen sits on a white dome) opens with a tiny folder that flashes a question mark, instead of a login to user's desktop, when booting up after a forced shutdown. How do I get my operating system working again? Thanks --Jim

The blinking question mark indicates that the firmware could not find a valid Operating System on your machine.
Your harddrive may have failed. Your filesystem may have be come corrupted.
Try these things.
-- try to boot up from the installation disc.
The startup manager will list all of your bootable partitions then give you a choice of which to boot. Hold down the option key then power on. Continue holding down the option key until you see the startup manager. This brings up the startup manager. Click on your hd or disc. Click on right arrow key.
-- Sometimes if volumes don't appear in Startup Manager (what you get when you hold down the Option key at startup), you need to reset the Mac's PRAM, NVRAM, and Open Firmware. Shut down the Mac, then power it up, and before the screen lights up, quickly hold down the Command, Option, P, and R keys, until the Mac has chimed twice more after the powerup chime.
Then, before the screen lights up, hold down Command-Option-O-F until the Open Firmware screen appears. Then enter these lines, pressing Return after each one:
reset-nvram
set-defaults
reset-all
"The reset-all command should restart your Mac. If so, you have successfully reset the Open Firmware settings."
http://support.apple.com/kb/TS1812?viewlocale=en_US
Should the fail...
Try taking the battery out for 10 minutes. Put battery back in. Cross fingers. Power the machine back on.
How to eject a cd from the internal cd drive:
eject cd
List of devices:
devalias
List of variables:
printenv
More than you ever wanted to know about open firmware
http://www.firmworks.com/QuickRef.html

IMac screen was scratched since we bought it, havent had the time to go...

We needed to keep the iMac around so I can do my work for teaching, since we just recently got a Macbook I can now do without my iMac for a few days. The issue I have is that the screen has been scratched since we bought it, but I didn't have a choice in being able to bring it back Apple for replacement since my other Mac had died and I needed certain software I use on the Mac for teaching.
The iMac is under a year old and just curious if anyone has ever had a similar situation OR maybe an Apple Rep can respond to this.

How long have you had the iMac? Unless you have had it only a short time, it's doubtful that you'll be able to convince Apple that the screen was scratched when you got it. You can of course call Apple and ask, or go back where you bought it if you purchased from an Apple Store. But if you've had it for a number of weeks or months, it's unlikely that they'll be able to do anything for you.
maybe an Apple Rep can respond to this.
As Dennis said, Apple technical and customer service representatives do not normally participate in these forums. You'll need to talk to Apple directly.
Good luck.

Do I need to calibrate my iMac screen

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