IMAC 21 Screen issues

I have a Intel based IMac that ramdonly has the screen start to look like someone took a square and rectangle cookie cutter to it and made a puzzle of it, with all the pieces mixed up. Goes away after a reboot, but has been happening randomly lately, Any help would be appreciated.
Thanks

I would recommend running Apple Hardware Test in Extended Mode, run it at least 2-3 times. If the system reports any errors then write down the errors and take the machine to your local Apple Store or AASP for repair.

Similar Messages

21.5 inch iMac yellow screen issue

I have a late 2012 iMac (21.5inch). I thought 21.5 models were immune to this issue, but I noticed bottom half of the screen is showing some yellow tint compared to upper half. I thought it was due to the angle of the screen and lighting in my room but that changed when I put my MacBook pro right next to my iMac. Compared to my mid 2009 MacBook Pro, the iMac's screen has a definite yellower time to it..
How much will it cost to replace the screen to eliminate the yellow tint? Please, no replies about taking my iMac to Apple store or calling them. I've already called several different Apple stores, and they have no idea. And please, no Applecare answers or "expensive" answers. I just want exact numbers.

The in-store inspection, product specialist or in-house expert, then technical testing to diagnose the exact cause of the issue, then if done in-house, a repair sequence initiated with an open estimate on what replacement parts would actually be needed, could alter the original best-guess somewhat.
A simple backlight or inverter issue may be all that is causing the symptom. Nobody can simply give you a base price of one size fits all. They will not just 'replace a display' since the panel is more than just one part. If a voltage variation is the cause of partial tint or backlight color, then that will be part of the inspection and diagnosis; this may be in a shop for weeks.
Please stick to one question on the same topic
https://discussions.apple.com/thread/5919757?tstart=0
You appear to have an issue with Apple, so there are
a few good links to their main web site. You can go
and Locate an authorized service nearby, contact an
Apple authorized representative, etc, there. We who
reply here have no direct connection, nor do we have
any authority, cannot cite prices or give quotes, etc.
And our time is our own, individually. We're not Apple.
You will have to contact Apple. You have a computer.
I will not do that for you, from my residence, half a
world away where I have no more access to a Store
than a moose, or a ptarmigan, outside my door.
Good luck.

21.5 inch iMac yellow screen issue - please read the question before answering

I have a late 2012 iMac (21.5inch). I thought 21.5 models were immune to this issue, but I noticed bottom half of the screen is showing some yellow tint compared to upper half. I thought it was due to the angle of the screen and lighting in my room but that changed when I put my MacBook pro right next to my iMac. Compared to my mid 2009 MacBook Pro, the iMac's screen has a definite yellower time to it..
How much will it cost to replace the screen to eliminate the yellow tint? Please, no replies about taking my iMac to Apple store or calling them. I've already called several different Apple stores, and they have no idea. And please, no Applecare answers or "expensive" answers. I already have Applecare. Yes, I know it's free if I have Applecare. I just want to know how much Apple will charge if I don't have Applecare.

If you don't have AppleCare, it will be probably pretty pricey (just to get them to open it up!).
If any past experience with iMacs doing similar things, it is probably one of the backlights they use for the screen.
That AppleCare does pay for itself when things like this happen.
Except for RAM, there are no user-serviceable parts in iMacs.

Imac g3 screen issues. (after attempting to upgrade.)

Hello!
I was installing mac osx on my failry old imac g3. It told me that my firmware needed to be installed. So I clicked restart. When it restarted, my screen didn't show up at all! I restarted again and my screen was faint, crooked and blue. Now I can't even run my original os9!
Did I delete some kind of screen setting!?
How should I fix this!?

For a firmware update to be applied to such a machine, the machine has
to be running/booted into OS 9.1/9.2; and support for the USB pen/flash
drive would have to be working inside the computer to import from one.
If the iMac G3 has FireWire ports, you could use a FW cable from another
Mac and use that Mac to import the firmware update into the hard drive of
the other computer; or use disk utilities of the proper type to attempt to
repair the old iMac's hard disk drive before going further. Could be not
only is the logicboard in jeopardy, the drive may also have issues.
[In some cases, a dead or weak clock battery can also be a problem in
the process of firmware updates and PRAM matters.]
The incompatibility of pre-Firmware updated iMac G3s to properly
display video is part of the symptom you get to experience in a sit-
uation where the OSX was installed (or X disc was used to boot the
computer, before firmware was updated in the running OS9 system.)
A different hard drive with the OS9 system for the iMac installed on it
with the Firmware Update on it, and put into the iMac could help in the
process; but you'd have to run the Firmware update after the computer
itself was physically installed in the drive to flash the computer's ROM
and upgrade the bootROM firmware to 4.1.9 or whatever your's needs.
A universally recorded CD-R would work in both a Mac and a PC; Mac
users have been making these for years, usually on a Mac, of course!
Discussions and ideas about the failed or non-applied firmware update:
Firmware problem solver tutorial for slot-loading CRT iMac G3s:
http://www.capecodgraphics.com/imac_firmware.htm
http://www.capecodgraphics.com/pages/macintosh.html
There are a few different approaches to attempting to solve this;
one company has a special process and wanted to sell something;
this following quote is someone's experience from the above link.
"...I thought, what the heck, it's good as dead already... why not try one
more thing? So, I held down the Programmer's button on the side of the
iMac while starting it up.. and bingo! It didn't shut down this time! The
screen was black, but it was up and running to some extent. I hooked up
a PC monitor to the iMac and saw the Open Firmware screen. This was
pretty exciting, until I realized that it was not accepting any input from the
keyboard or mouse. What now? I stuck my OS 9.2 CD into the slot, did
the "3 finger salute" reboot, held down the C key and prayed harder than I
have in a while.... and eureka! The CD booted the iMac successfully! I
was able to do a clean install of the OS to upgrade it from 9.0 to 9.2,
restart the Mac; then upgrade its firmware..." -- may not be repeatable.
Anyway, hopefully you get more feedback on this and a resolution solution!

Imac g5, screen issue, gets main and second display but only shows second which is 800x600, not the 1600x1400

Hello, i have a power pc g5 running 10.3.5 i have a issue not being able to get the correct display to show. When it start up it comes up with a screen size of 800x600, which i can not change or select the main display, also the computer computer does not shut down or restart unless you hold the power button. Hopefully someone can help me, i am new to apples, i have a few for my kids and i am learning, any help would be appricated. Thank you

not sure how to update this , this ia a imac 20 inch all in one desktop

IMac Having screen issues when in sleep mode

Hey everyone,
Does anyone have this problem, when my computer goes into sleep mode the screen turns like this...

Thanks for the suggestion, I have firstly gone through the procedure suggested in the article 'Resetting the system management Controller' before actually resetting it. Should the iMac fail to come out of sleep mode then I shall reset as you suggest.

New iMac 27" screen issues!!!

Does anyone experiences this situation on their iMac with new "Screen LaminationProcess" ?
After leaving a white image still for couple minutes on the screen (Example: Web Site), a sort of halo remains.... This is noticeable when I working on applications with gray GUI's like Adobe Photoshop, Aperture, iMovie... pretty much any application.
I am kind of upset because the computer is only 1 month old and I just noticed this problem. Besides, there are some awkward brighter spots on the edges of the display… it seems like there is a leak of light from the inside out. That cannot be shown on the screen shots but they are bery anoying when watching a movie... ;(

You really should call AppleCare first. Let them be aware of the problems you are having. You will get a case number. Keep it in a safe place. It just may come in handy if the exact same problems crop up in the future after your warranty runs out.

Just wondering what Apple's stand is on the issue with a flickering and a dark area appearing on imac 27"screen - forums seem to indicate this is not uncommon - and happens through normal use - so should be subject to repair (Sale of Goods Act - 6 years)

Just wondering what Apple's stand is on the issue with a flickering and a dark area appearing on imac 27"screen - forums seem to indicate this is not uncommon - and happens through normal use - so should be subject to repair (Sale of Goods Act - ie 6 year warranty)

We are just users like yourself. If Apple has stated publicly about the problems you mentioned, it will be listed on their website and/or in one of their Knowledge Base Articles.
I have a 27" & do not suffer from such a problem. 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 these forums as a hospital emergency room.

IMac screen issues-turns black then to log-in screen

I own a late 2102 iMac, 21.5 inch. 2.9GHz Intel Core i5 with 8GB memory. Storage=1 Terabyte. Running Yosemite 10.10.1. Several times in the past two months while I am using my iMac, my screen has become very bright, then suddenly switches to a black screen with just the cursor showing. It then switches to the user login screen. Today I was just syncing my iPhone 5S to iTunes. Nothing radical. In the past, I was using Word or sending an iMessage. Instead of logging back on as the same user, I opted to restart. When I restarted, iTunes opened back up as did PowerPoint, which was random since I hadn't been using PowerPoint nor was it even open in the Dock. I have restarted the iMac on several occasions using Command-R and ran Disk Utilities with no problems showing up. Has anyone else experienced the same or similar problem? Is it a Yosemite problem or a hardware problem? Any solutions?

1) You need to Find the crack on Sim 3 game on Google and Copy and replace the File with new crack and problem will get solved.
Try downclocking your >>GPU<<
try lowering it more and keep testing with each one. If you have another power supply test with that(but its HIGHLY unlikely that its your psu). But overclocked cards demand more power as far as i know and it might be getting tough for the psu to handle.
And is the space freeing up on only c drive? It happens all the time. temp files getting deleted and all that. but virus scan and chkdsk wouldnt hurt..................
Take pleasure in knowing that your problem is nothing compared to what most people i stated above are facing. they cant for more than ten minutes. your crash occurred only watch serials once and a after a long time right? see if it happens again. it might get more frequent in which case you problem is very .....problematic.

Possible solution for white C2D iMacs with screen artifacts or lines

I have a white 20" Core 2 Duo iMac with the famous screen artifacts issues. Screen tearing, horizontal lines, goofy pixels, you name it. From my research it seems there are countless others with these problems.
I tried running the SMC fan control app to boost fan speeds. This helped a little, but did not completely solve the issue. A lot of people think these issues are related to heat, and I agree, but only partially. When a graphics chip overheats it is eventually damaged. I have damaged my share of graphics chips while overclocking them in my PCs. In the case of my iMac and maybe plenty of others, I still have issues if the GPU is hot or cold.
I installed WinXP using bootcamp. I finally found an application which will change the clock speed of the GPU on the fly. The X1600 GPU in my iMac has a 475Mhz core speed and 500Mhz memory speed. I cut these down to 400Mhz on the core and 400Mhz on the memory. At these lower speeds I no longer have any issues with screen tearing, horizontal lines, or random crashing. I do still have a few wierd pixels here and there, but they are not all that noticeable and I can live with them.
Now for the fun part. I wanted to permanently fix these speeds into my GPU so when I boot back to Mac OS X, I don't have any issues, and I no longer have to boost fan speeds or run any additional apps. I spent most of today taking apart my iMac, putting DOS on a spare SATA hard drive, and running an external monitor while booting my iMac with the spare drive hanging out the side. All this so I can run ATIflash, and use it to dump an image of the GPU BIOS ROM file.
Well, I ended up finding out the ATI GPU has no ROM to flash. My best guess is open firmware or something like that passes this data on to the GPU when the system boots.
So, in my case slowing the GPU down significantly reduced my problems while running within windows. I am 100% confident slowing the GPU down will also improve issues within Mac OS X, but I have no way to pull this off.
If Apple reads this, or if anyone has any connections at Apple, can we please get an optional firmware update to reduce the speeds of the X1600 GPU? It won't fix all the iMacs with these issues, but it will fix quite a few, and for those out there who don't have any issues at all with their white C2D iMacs, lowering the GPU speeds will most likely prevent damage from inevitably occurring, keeping them a happy customer.
Now, some of you may not like the idea of a slower GPU, but if I have to pick between a slower GPU and an $800 logic board, I will take the slower GPU any day.

There is a little easier Way to Navigate in Doing an F.D.R. than that Method: I listed it here if you prefer going this Route..
2. Re: FACTORY RESET FOR RAZR AN RAZR MAXX

The Windows 7 Black Screen Issue

I am putting in Bootcamp with a Windows 7 install. I checked these forums and made sure I had all my prep work done.
I referenced article TS3173 and downloaded the neccessary drivers for 7, formatted a 16GB SD Card as FAT Bootable and copied the drivers and autounattend.xml files onto the root of the drive.
THe installation as going as planned but at the end I'm still ending up with a black screen. Windows is installed ok but on the restart after" Preparing for FIrst Use" comes up the screen goes black.
Obviously, the drivers are not being installed from the SD card, I tried it on a USB External driver as well. Am I missing something here? I read every post I could find on it and I can't see where I am doing anything incorrectly.
Thanks
Tom

You don't need Paragon or another NTFS driver. That may work (I've used it, but I was using a full hard drive anyway to begin with).
Apple's method:
http://www.apple.com/support/bootcamp/
*My iMac (27-inch, Late 2009) displays a black screen during installation of Microsoft Windows 7 using the Boot Camp Assistant. How do I fix it?*
The Windows 7 installer does not include required graphics or Bluetooth drivers for this computer. To obtain the necessary drivers and resolve the issue, see this article (creating the SD card and drivers for the "black screen" issue).
http://support.apple.com/kb/HT3986
http://support.apple.com/kb/TS3173

Imac blueish screen/pinkscreen and lines RANT!

I work in a University and one of our labs has 52 imacs, I must say that they have been the most unreliable machines we have ever bought, expensive to purchase compared to the pc's in the other labs and difficult/expensive to repair. Apple support has been terrible, they are 2 years old 6 have blue/green screens, 3 pink and five others with lines that apprear at random times, the lenght of time it takes apple to fix a fault is rather shocking, we had 4 machins away for nearly six months. we had crt imacs before and they were fairly reliable, these flat panels are terrible, all screen issues no other hardware problems. some of the solutins apple have offered are an absolute disgrace, 2 months waiting to be told to switch them off overnight! great in a 24hour lab, don;t move the screens around so much! and the best one, perhaps the room is too hot with all those machines in it! yes thats right Apple, we keep the students crushed together in a small wooden barn.... Apple have really gone downhill, we have sent back 4 powerbooks, 3 ibooks and had replacement batteries and logicboards under the exchange program in the last year, poor poor poor, still My ipod still works, yay Apple

Yesterday my iMac G4 took a powder with the "pink screen of death" when I woke it up from sleeping. At first I thought it was odd that it would have a pink hue on Valentines Day, but my iMac G5 was fine. I have 10.4.4 and Sophos AV installed on both. I never move the computer (ever) and I have it in an area with good air flow.
So I look it up on the support to no avail. I found some links in the outside world to forum posts that are now missing (deleted). So I just decided to view the posts one-by-one on here and there has to be several dozen different threads started.
My machine is less than three years old, but I didn't RTFD on activating the warranty so therefore I am SOL on getting it fixed through Apple. I talked to an old workmate who is the IT Dir for a school running 500+ iMac G4 (and G5). He told me that he has had close to a dozen failures in the past two months. His Apple support has been poor, in his opinion, but he was able to get them fixed under warranty. He did however, tell me how to fix it, and pointed me to some web articles.
So I tried the fixes on the monitor cable and it appears to have worked for now. The video cable didn't look loose to begin with but pushing it down harder seemed to do the trick. Buying the Heat Sink Compound, an important step, was easy as most Radio Shacks carry it for under $3USD. I doubt that most people would be able to pull this repair off themselves though.
My point is that this does seem to be a widespread issue and I can only hope that Apple does the right thing. I know they have extended repairs past warranty expirations in the past and think they should consider doing that here to save people the hassle of doing it themselves or having some repair shop botch it for $$$.

Please Help: iMac black screens after startup logo + spinning wheel no cursor).

Hi, guys.
I'm in a fair bit of a desperate situation; my iMac's screen seems to shut down every time after the white startup screen. The Apple logo appears, & the progress wheel begins spinning, then after a while - when it would usually then go to the gray login screen - it would, instead, go black. I can tell that the machine is still on (I can still hear it clicking as it does during processing) but I'm unable to determine anything else. Nothing is visible on the screen - not even the cursor - it's as if the display had turned off completely. I'm not sure if the login screen sits beneath that black screen (I have tried to log on by typing my login details in blindly, but even if it does log in, it's hard to determine what state the computer is in without seeing the screen.
I have tried the PRAM reset (holding CMD+OPT+P+R) during both the white startup screen, & the black screen to no avail. It seems unresponsive because I don't hear any additional chimes that I've been told should be heard during a PRAM reset attempt. I can't even be sure that the command is being inputted correctly because the light on my wireless keyboard remains off during the process.
I've tried rebooting over & over again; the results are the same.
The steps that led to the problem occurred thusly:
1 - I was trying to clear some memory from my current session, so I scanned through my active processes, quitting anything which seemed to be eating up considerable amounts of memory.
2 - One particular process I quit was 'launchd' which was functioning under my profile username.
3 - After quitting launchd, all opened apps seemed to close, & it looked like I was forcibly logged off the machine. The screen froze during this point, & I decided to do a hard reboot to log back in.
4 - The problem began after this hard reboot; startup seemed to occur as per usual; white screen > apple logo > progress wheel > and then suddenly, a black screen where the login screen should be.
I've shown a flashlight into the screen while it's black & it seems well & truly like the display has shut down while the iMac continues in the background. I have had issues relating to my screen going black before, but they were random & intermittent; they didn't occur without fail during the exact same time immediately after startup, & could be remedied by using the CTRL+OPT+EJT keys.
I am on an iMac 2010, 27", using I believe Lion OSX. I am unable to recall additional specifications while the problem persists.
Could anybody please help me? I'm quite desperate; I was in the middle of some urgent work that I need to get back to as soon as possible.
Thank you I'm advance to anyone with advice on how I can go about fixing this.
,c.

Gray screen appears during startup

New iMac 27inch screen flickering/tearing/shutoff (continued)

This thread is a continuation of [New iMac 27inch screen flickering/tearing/shutoff|http://discussions.apple.com/thread.jspa?threadID=22 12682]. The thread was becoming too long and was causing some browsers to time out. The older thread has been locked.

citrus101 wrote:
Hi Brett L,
thank you for the coordination of this helpful thread. Are you Apple? If yes, please allow me to ask you three questions:
1) The Display Firmware stopped for over 90% the flicker issue, but what has this Firmware changed exactly?
2) Is Apple preparing a fix for the yellow tinge?
3) When will it be save to buy a new iMac?
Thank you for your efforts.
Hello Citrus.
Excellent questions.
I hope that Apple will authorize Brett L. to provide us with some clear, honest answers to them . . . although, as I pointed out before, it would seem by the latest messages that have been posted in this thread -- that is, the *original thread* -- that through their actions, Apple has already provided us with their answer -- and solution -- to the yellow tinge issue; and that is the replacement of the LCD panel.
As to what the most recent display firmware update did, I am doubtful that Apple will allow Brett to reveal that kind of information, but we can be hopeful.
As far as when it will be safe to purchase a new iMac, I seriously doubt that Apple will say anything which would suggest that it is not safe to purchase a new iMac now. What company is going to say "Don't buy our product now. It's not safe"?
For my part, I have now contacted Apple regarding the issues that I am having with my 27" iMac, and I will wait over the next few days to see how things play out. Based on the testimonies of others here, I don't expect Apple to disappoint. I have the confidence that they want to leave me a satisfied customer who will continue to purchase their products in the future.
Message was edited by: Warren Beasley

2009 iMac 27in - screen burn visible (Pics)

Hey everyone, I have an i5 that I bought back in 2009 that has started developing screen issues. There seems to be a ripple on the right side of my screen internally, that is visible only on flat colored backgrounds. I use my iMac for a couple of hours a day, put it to sleep at night, and have been using my Belfan adapter to use a display for my 360 as well.
Has anyone had any similar issues? I think my warranty has run out...should I haul it to the Apple store for help? Thanks in advance.

unless you have AppleCare your warranty is long gone. You need to bring that to Apple to have it fixed (new screen). I have no idea how much it costs.

IMAC 21 Screen issues

Similar Messages

Maybe you are looking for