Reduced brightnes on half iMac screen.

Out of the blue the brightness of the display is constantly reduced on the top half of the screen.
It goes from being bright(normal) from the bottom and slowly faded into much darker at the top of the screen.
When it wakes from display sleep it appears normal in about a second then goes back to the split screen.
I have tried to reset the firmware, but it hasn't helped.
Hope someone can help.
Thanks

Ditto to Denny's advice! Run, not walk to the nearest Authorized repair center. iMac screens are about US$700.00 to replace if the warranty has expired. If you do not have Apple Care and your Mac is still in the original 1 year warranty, get Apple Care and extend the warranty for two more years. Just one costly repair will more than pay for the Apple Care coverage.

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Imac with half the screen psychedelic

Mid-2008 iMac with "ATA Radeon HD 2400 XT" graphics card. Just started going psychedelic on the exact left side of the screen. Intermittent it seems but getting more permanent with use. Everything works with the new colors, mouse clicks, etc., but the colors are all wierd and everything is fuzzed up. Screenshot ends up looking like all is normal so I'm assuming this is a screen/graphic issue.
So I ran hardware test and it passed with no faults. I reinstalled the OS (archive and install) with no improvement. And I'm typing on the right hand side of the screen as the left is not usable.
From what I have found on similar problems online, this is a very expensive fix and not worth the cost of the repair when compared with new. Questions:
Any other actions, tests, diagnostics I can take to confirm problem or (perhaps) repair?
If this is logic board or such, expensive to fix as I suspect?
Is this to be expected from a 3 1/2 year old machine? My iBook is going on 7 years with no problems other than a dull screen and dead battery.
Given that I would not chance a new iMac again if this turns out ugly, what Mac alternative might be more reliable?
What to do with the old machine? Ideas?
Yes I had bought Applecare, no I'm not criticizing Apple. But I cannot afford a machine that is throwaway at 40 months.

Thought I'd update this in the hopes of getting at least a single idea or reply. Took the machine to the Apple Store where the Genius Bar folks wired up a second monitor and confirmed (at least they think so) that it's the screen and not some hardware issue.
The problem is the intermittency of the whole problem. For the past two weeks the screen has been fine, no psycedelic colors. Now, I'm typing on the right half of my screen because the exact left side is all 60's mind-bending colors. Everything works over there, but unless I can somehow do drugs only in my left eye, I'm stuck with a half a screen to work with.
Apple wants $400 to change out the screen, but I 1. don't trust it's the screen since it works SOME of the time, and 2. don't want to spend 1/3 the cost of new on a 3 1/2 year old computer. Unfortunately I'm also leery right now about another Mac. Fortunately my seven year old iBook is still plugging along.
So, any suggestions?

The screen of my imac always goes to the maximum exposure. Then the light icon on the screen. After reducing the brightness goes my screen after a few minutes back to the maximum intensity with the brightness icon back on my TV screen.

The screen of my imac always goes to the maximum exposure. Then appear the light icon on the screen. After reducing the brightness goes my screen after a few minutes back to the maximum intensity with the brightness icon back on my screen.

Try resetting the SMC and if that doesn't work then reset the PRAM too.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

My imac screen went half dark, can I fix this myself??

My 24' Imac screen went 1/2 black on top the bottom is fine, can I fix this myself??? HELP

You really should contact Apple or your local AASP and have it checked out.
Apple - Support - iMac - Service FAQ

Half the screen on my 2010 27" imac just went grey today. I just bought it six weeks ago. Is this a common problem. I am getting a headache ... grey

Half the screen on my 2010 27" mac just went grey today. I bought the computer six weeks ago. Is this a common problem with the monitor?

I think there's some provision for a home visit if you have AppleCare. Don't know about the standard warranty. Maybe you can arrange to ship it? Give them a call on Tuesday. Bummer.

24" iMac screen mist behind glass

For a couple of months now my 24" iMac screen keep misting up behind the glass around 30 mins after booting - anyone know a resolution for this? Will Apple replace the screen even though i've had it around 4/5 years now?

scottycross wrote:
For a couple of months now my 24" iMac screen keep misting up behind the glass around 30 mins after booting - anyone know a resolution for this?
It is common to get condensation between the display and front glass panel, if it is humidity and cool in your office or home.
A few things that you might try, are
1. Reduce the level humidity with a dehumidifier.
2. Leave the iMac on longer until the condensation dissipates.
3. Remove the front panel yourself and clean between the display and glass.
Will Apple replace the screen even though i've had it around 4/5 years now?
No, but if you contact your local Apple Store or AASP you can schedule an appointment to have it dried and cleaned.

2010 27in imac screen failure

my 2010 27 in imac screen has failed, right half of screen grey shadow, dark, i note that this has been a problem in the past, seems that apple ireland are not concerned? any opinions or suggestions? seems that there are major reliability issues with imac
extremely disappointed with product and apple support.

Your are missing the point. Yes, there will be the occasional Mac that has a display failure.. Yes, there will be a number of LCD displays that fail out of the millions of Macs that are assembled with LCD displays. And yes, techs will be seeing those occasional display failures over the wide array of Mac models upon which they work. But there are a number of companies that make LCD displays for Apple with the various Mac models that exist. And sometimes there are different companies making the displays for the same Mac model. These are the random, occasional display failures that can be expected with every computer manufacturer who assembles massive numbers of computers; Apple, Toshiba, Dell, Sony and on and on.
But the point is that the link that I gave you points to a consistent mass failure of displays on the same iMac model, assembled in the same factory, over the same time period with displays from the same manufacturer. That doesn't exist for your iMac. If it did we would see folks posting about it here in large numbers, just as we did back in 2006 and 2007, which we are not.

I have a problem with my imac screen there is a degradation in the display

I have a problem with my imac screen there is a degradation in the display at the toplight is less intense as if you were at rest and half way on this but not if it's some software problem or please someone help me thanks.

Still in guarantee? Apple Care? Bring it to an Apple Store oder Apple Service Provider.

Imac screen

24" imac less than a year old. Half the screen just turned black. ???
Anybody else had this happen? Don't suppose there is an easy fix.....
Thanks for any help.

Welcome to Apple Discussions!
Try both a PRAM reset and then an SMC reset to nudge the graphics system to perform properly.
Make sure you have all software and firmware updates applied for your system.
Less than a year old, it's covered by AppleCare so give Apple a call if the above doesn't help. Hope you have a recent backup or up-to-date Time Machine backup so you can recover your data just in case they want to replace the machine. If not are you able to take a backup with the screen malfunctioning?
Sounds like you have graphics problem but it could be related to your circuit board. Are you able to run an Apple Hardware Test to look at those results?
Message was edited by: Rick Lang

Which MacBook Pro screen more closely resembles the iMAC screen?

I know the MacBook Pros come in either matte or glossy. I know the matte reduces glare, but I love the way my iMac looks

The glossy screen for the MacBook Pro closely resembles your iMac screen. Note, glossy screens are preferred for viewing photos since it enriches the colours more.

Anyone else have half their screen go dark?

I've had my 27" iMac since May (bought refurbished from Apple.com), which had some yellowing and backlight issues, but I decided to just deal with it based on all the horror stories I've heard about going through a half dozen returns. But in the past few weeks, my iMac's screen began flickering every so often and dimming on the left side of the screen at random intervals.
Finally, today, half my screen went dark and it's not changing:
http://img535.imageshack.us/img535/940/screenwoh.jpg
I don't have AppleCare, but I hope the standard one-year warranty covers this.

My monitor started flickering this morning and by afternoon, the bottom half of my screen went gray or darker than the top half. I have an early 2008 model 20" iMac. I guess my computer is starting to go bad. My DVD drive stopped working correctly a couple of months ago as well. I can't burn DVD's anymore; keep getting error messages. My guess is that the heat generated on the iMac must shorten the lifespan of all the components inside, considering they are all so close to each other. If you've ever touched the top of your iMac, you'll understand what I'm talking about, as it gets extremely hot up there. Imagine what it must be like inside. This is my first iMac and will probably be my last. I paid too much for my computer to last such a short time. I like the compactness of it, but it's not worth the cost. All-in-on units make it more difficult to fix and more costly to fix as well.

Why does my iMac screen keep switching off / going black?

After about one half hour of use my new iMac screen switches off / goes black.
The screen can be switched on by pressing the power button on the back on the machine a few times. It remains lit for about 20 seconds. This can comntinue for about half an hour when it stops switching off or when I give up.
I have conrtacted Apple but they have been unable to solve the problem.
The machine is just not fit for purpose as I cannot use it for work.
It appears from the internet that this is a recurring imac problem.
Please, what am I to do?

Call AppleCare (number is in the manual) and then request to speak to Customer Service. Be patient, organized and articulate and they will transfer you. When you get to speakt to someone then explain your problem and ask for their help. You should have all your receipts, invoices, trouble ticket numbers etc available for reference.
You can also take to an Apple Store in Spain, while this may not be convenient at least then an Apple person can see the machine and work on it.

Colored vertical lines on half my screen

I have had my iMac a couple weeks. I bought a refurbished one from the Apple Store. After I turn it off and then back on, I noticed half the screen will have very colorful vertical lines. After several minutes, it will go away, sometimes I can still see them faintly, but then eventually, not at all. Today, after it was 'asleep' and I started it, it did it again.
This is on the 21.5" screen. Has anyone else had this issue. Is there an easy fix, or am I going to have to send it off? I just got it, I really don't want to lose it for weeks.....Thanks.

Hello daytondunn
Welcome to Apple Support Communities
Unfortunately you will need to contact Apple Support.
http://www.apple.com/support/contact/
Dennis

New 27" iMac Screen Has Grey Marks

Called Apple support. They just told me to take into an Apple store. I've had my new iMac for maybe two weeks now and I just started to notice the lower half of my iMac screen has a sort of grey / purple residue throughout. Not sure if it's on the outside or the inside but it appears to be on the out. I've tried wiping the screen several times with the black cloth that came with my computer but nothing gets rid of it. I've also tried a very damp cloth.
Any ideas?

I have a late 2009 21.5 iMac.
Last night my friend brought his mid 21.5 2010 iMac here so I could upgrade him to Yosemite ( I have very fast internet).
Anyway, side by side, the 2010 iMac is EXTREMELY bright compared to my late 2009 iMac.
Here is a photo that I took of them to give an idea. I posted a question about it elsewhere here but no responses yet.
You can see the color profiles for each. The 2010 is on the left, 2009 on the right. I wonder if there's a way to adjust the color profile to match the 2010?
If you look ...you can see mine has a grey tinge ....(it looks yellow on my monitor but on the camera and to my eyes, mine is definitely a grey tinge. The 2010 is bright white no matter where you look at it.
Below is a link to my original post in detail for anyone who might have a solution:
https://discussions.apple.com/thread/6629552

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.

Reduced brightnes on half iMac screen.

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