IMac 27" screen/operating issues

Hoping for insight. I have an iMac 27" that is a couple years old. Operated perfectly since purchase. A few days ago it started turning itself off and restarting without any pattern, I could be online or just in Mail. Then whilst online with Safari the entire screen display became patterned with little boxes about a quarter inch apart (with the screen understandable but with a matrix pattern on it) and completely covered the screen, the mouse cursor would move but was ineffective. Then it shut down/turned off and did not restart. I restarted it and it looked fine. I checked all the typical things, ran verifies and the like, reset PRAM and the Apple Hardware Test. Discovered bad RAM, pulled it, restarted with remaining good RAM, ran the test with no trouble found. I am ordering new RAM. I have been operating with the remaining 2 GB of RAM since but since pulling out the bad RAM I have had the pixilated little square dot display problem (but not the shut downs) so I am wondering if I have deeper problems than the RAM. I have pictures of the screen with the pattern on it but am clueless as to how to add them to this plea.

just click here to upload an image....
it ll help in speedy diagnosis...

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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.

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.

21.5" iMac i3 2010 mid screen flash issue

Mine is i3 entry level iMac. When I activate the screen shortly after it goes to sleep, the screen will flash once before it come to steady. I use expose to demonstrate this problem. This also happens when my iMac is set to restart. Is it the norm???
Here is the video for ref.
http://www.youtube.com/watch?v=VelxBowlVYI

I use both native and non-active resolution, this screen flash issue still happens. For my other Mac screen, they just lit up and come to steady immediately. I wonder if all i3 entry level iMac have this issue. But it is strange that the screen seems unable to lit up right after you activate the screen.

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

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

Screen-touch issues

The left side of my screen is not responding to any touch and I have tried all the troubleshooting suggestions (reboot, restore, etc.). I cannot 'slide to open' my Ipod and I cannot enter my password on the left side of the screen but the right side works just fine. The left of the screen is officially busted. Can it be repaired or not?

Hi Johnny,
Try removing any accessories that might interfere with the touch screen operation. Also, try the general tips in this article: http://support.apple.com/kb/ts1827.
If the issue persists, the iPod touch will most likely need service. The article above provides a link to the iPod touch Service FAQ, but you can also just make a reservation with a Genius here: http://www.apple.com/retail/geniusbar/
Message was edited by: Jason L

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

My iMac 17" screen turn black, any one able to provide solutions

My iMac 17" screen turn black when I relocation the computer, any one can provide solutions, thanks

Hello, Bernardneoh.
Thank you for visiting Apple Support Communities.
Here is a troubleshooting article that I would recommend going through when experiencing this issue.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Cheers,
Jason H.

O.T. iMac and Epson Printer Issues

I have just set up my new 20" iMac running OS 10.5.6 and have been testing my various peripherals.
Printing old saved PSE3.0 images on my Epson 1290 (1280) they are coming out noticeably darker than when printed under OS 10.3.9. I deliberately did nothing with the saved files in PSE,just clicked print to avoid introducing any screen calibration issues,and the correct .icc profile had been added to Library/Color Sync/ Profiles for the paper I was using (and have always used).
Is this a known problem with an iMac running Leopard ?

Perhaps I should have done this before starting my thread,but who wants to reinvent the wheel !
Having spent many hours this morning,and even more sheets of paper to resolve this problem,I have come to the following conclusions on printing an image from PSE3 in Leopard :
USING THE EPSON PRINTER DRIVER -
Leave the printer manage colour - color controls - photo realistic - gamma 1.8
USING GUTENPRINT DRIVER (http://gimp-print.sourceforge.net/MacOSX.php)
Make no changes to Color Sync use Automatic
Do not change the .icc profile (although I did leave it set in PSE3).
Adjust print quality to max possible.
Both these options give acceptable prints, Epson perhaps a shade darker.
I preferred the colour representation in Gutenprint,but that is obviously a personal thing. Whether they'd satisfy someone making a living from photography is another matter.
In the future I will probably tweak the lightness in PSE to compensate for the slight darkening in the print process,but probably leave the colours alone.
Two other points -
The Gutenprint driver seems to print more quickly.
Adobe and Apple don't seem to care.

When using my iMac the screen turned blue and so I turned the compute off. When I turn on again power does get to the computer but there are no chimes and the screen remains black. Any advise please. David

When using my iMac the screen turned blue and so I turned the compute off. When I turn on again power does get to the computer but there are no chimes and the screen remains black. Any advise please. David

Hello DJJOC,
Thanks for using Apple Support Communities.
To start troubleshooting this issue where your iMac's screen will not illuminate, please reset your SMC by following the information outlined below.
Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
Note: For Intel-based Xserve computers that are not responding, you can shut down locally, or by using remote commands, or by pressing and holding the power button for five seconds.
Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support
Take care,
Alex H.

IMac 2011, screen freezes and fans start spinning

Hello,
I have this really wierd problem with my iMac i5 2011 edition since a month or so...
A lot of times when I am downloading or watching a movie or playing games under OSX on my iMac my screen slowly freezes, it always starts with my finder and then te rest goes, I get the marble of death and shortly after that the fans start spinning like crazy, they start slow but after a minute or so they make a lot of nice. Take in mind then I am unable to use my iMac in anyway, the mouse moves but it doesn't respond to clicks and also my keyboard doesn't respond, I keep getting the marble of death still.
The wierd thing is that sometimes it doesn't do this for 2/3 days and sometimes it does it like 3/4 in an hour (have to restart manually). Also, this is very interesting, I have a version of Windows 7 installed on my iMac wich I use mainly for gaming and under windows it NEVER freezes in any kind, even when I game like 5/6 hours long straight.
Therefor I thought it must be a software problem so I did a complete system reboot 2 days ago but that didn't help, already froze 3 times since...
Can anyone help me? I still have 2 months of applecare but I have a LAN party soon so I am not to anxious to go 3 weeks without my iMac, maybe there is a simple solution that I am missing...

Some things you can try:
1. Try a new user account, create one in System Preferences -> Users and Groups, test to see if the issue still persists in this new user account, this will give us a lot of information. (if the problem is the same or it vanishes, let us know)
2. Make sure all your software is up-to-date, Apple Logo -> Software update.
3. Unplug all 3rd party devices, just keep in the necessary, Power, Keyboard + Mouse, no ethernet or external hard drives etc.
4. Reset the PRAM http://support.apple.com/kb/PH4405
5. Reset the SMC http://support.apple.com/kb/HT3964
6. Boot to the recovery partition (CMD + R on startup until you see a spinning cog with an apple logo, then let go) -> Choose english as the main language -> Choose Disk Utility -> Select your hard drive from the left pane of Disk Utility (NOT Macintosh HD, the one that will look similar to: 1TB ST3200WAJS) -> Select the 'First Aid' tab -> Bottom right of the window it will say 'S.M.A.R.T Status: ________' ... What does it say after smart status?
7. While still inside the Recovery Partition, select Macintosh HD -> First Aid (tab) -> Verify Disk -> Repair Disk (unless it says the volume Macintosh HD appears to be OK) -> Verify Disk Permissions -> Repair Disk Permissions (if there are differing permissions on the disk)
Let us know if the issue still persists, but make sure you do all of those steps correctly and post back as much information as possible (PRAM takes two chimes at startup, unplug the power cable for 15 seconds, plug it back in, wait 5 seconds, turn on... make sure you follow all articles)
Good Luck!
MiiCK

My iMac 27inch screen keeps going black but everything is still running in the background? please help

My iMac 27inch screen keeps going black but everything is still running in the background? please help. I have read that apple are recalling 27inch iMacs....

Hello @DesCherryBomb,
I understand that you are having issues with your HP 2310m monitor going blank and/or flickering. I am providing you with some steps you can try below:
Step 1. Unplug the power cord from the back of the monitor and the wall
Step 2. Hold the power button down for at least one minute
Step 3. Plug the power cord back into the monitor and then into the wall outlet (not a power bar or surge protector)
Step 4. Press the Menu button on the monitor
Step 5. Navigate to the Factory Reset option and select it
If the above steps did not resolve your issue you can try the monitor on a computer or other device to see if the issue persists. Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
Thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

IMac 27 "screen out of control, I am experiencing the transition to sleep mode.

The following general specifications of the devices have experienced periodic shortages is this.
27-inch, Late 2009
CPU 2,66 GHz Intel Core i5
RAM 8 GB 1067 MHz DDR3
Graphic Card ATI Radeon HD 4850 512 MB
Serial Number xxxxxxxxxxx
OS X 10.8.5 (12F45)
iMac Display:
Screen: LCD
Res.: 2560 x 1440
Pixel: 32 Bit Colurs
Main Screen: Evet
Online: Evet
Inline: Evet
DisplayPort
PROBLEM
* Routine operation of the device , the screen goes into sleep mode at a time .
* Hard Drive is studying .
* But the screen shuts off completely which does not allow for inaction .
* Therefore, computer harddisk along with the device by pressing the release button 'm having to sleep mode .
* I wake again by pressing the release button .
* The screen is now out of control appropriate to the mode you have to repeat this process every time I'm staying.
I do the following
* System Preferences / Energy Saving / screen to sleep (never )
PROBLEM WAS soln ?
* No
IN ADDITION
* I'm dealing with advertising design business .
* Illustrator, Photoshop, I'm working with software such as performance needs .
* I live my productivity as well as routine problems and flat affect my work on the property .
FINALLY
* Approximately 2 months ago the device's graphics card is renewed.
* Was upgraded with a new video card .
* Graphics card has been replaced after 1 month I faced this problem .
Does the problem is hardware or software- m I have no idea about .
Your ideas and comments are important to me .
Thank you.

Using ten foot pole...
Sounds like you need to take it back to whomever serviced it 2 months ago and have them honor the warranty on there repair work.

IMac 27" screen/operating issues

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