Imac 21.5 (ver 10.6.8) Display flickers and it goes blank

Display flickers and its brightness automatically increases and decreases intermittently. After some time the Display goes blank and it doesn't appear even after pressing the power button or restarting the PC. At times it does appear after pressing the power button frequently or if the PC is left ON for some time. I am using software ver 10.6.8. Want to whether this problem will be resolved after upgrading it to Mavericks. But I am worried that during the downloading if the display goes off and if I have to restart the PC then I will have to start the downloading from the beginning. Please suggest.

If you live near an Apple Store, make a Genius Bar appointment to have the computer tested. Supposedly there is no charge for testing. Use 2nd link if not near an Apple Store or aren’t in the US.
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24" Cinema Display flickering and eventually going dark

I am having a repeat of a problem with my Apple 24" Cinema Display. The symptoms are the display will go black and come back on (flicker) and sometimes it takes a few seconds for it to come back. All USB devices connected to the Cinema Display become disconnected from my MacBook Pro when this happens.
Last time this happened it started slowly and as time passed it happened more frequently. When I brought it into the store they were able to reproduce the problem immediately. They replaced the logic board in the monitor.
I contacted support again. The display is still under warrantee. They scheduled an appointment for me to bring the display in. I am seeing the same behavior where the frequency of this problem increases as time passes.
I am concerned they will be unable to quickly reproduce the problem again and not fix it, or fix it and the problem will come back again in a few months. I am afraid that I will still be having this problem after the warrantee expires.
I've purchased many displays over the years (including Apple) and this is the first time I have ever had a problem. I think I may have had a lemon.
I originally posted in these now archived threads:
http://discussions.apple.com/thread.jspa?messageID=12175983#12175983
and
http://discussions.apple.com/message.jspa?messageID=12311032#12311032

Just a quick update. I brought the display into my local Apple store. After they reviewed the records from the previous repair and my description of the problem they believe it could be a power supply problem inside the monitor. The power supply may have caused the logic board to go bad. Replacing the logic board last time fixed the problem but the bad power supply ended up causing the problem to return.
I let them know that I was concerned that this is a reoccurring problem and my warrantee expires in July. I don't want to see this problem come back after the warrantee expires.
I'm not sure what they will do if that happens. I hope this problem gets fixed this time around.

23" cinema Display flickers and goes to black

Hey all,
I am running two 23" cinema displays and one of them is flickering and going to black. Here is a video of it.
http://larskoerkemeier.com/MVI_0972.MOV
The curved bands arent there thats just from the filming but what happens is the entire image shifts up very quickly and what you see flash on the bottom is actually the top. It repeats this a couple times and then turns off and then it repeats and after a couple times the display just stays off.
System:
Model Name: Mac Pro
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2.66 GHz
Memory: 6 GB
Graphics Card: NVIDIA GeForce 7300 GT
Thanks,
-Lars

Hi-
Try switching the power adapters to see if the problem moves to the other display.
Of course, reconnecting/double checking all connections is a good idea.
Other than that, any references in Console/Logs regarding graphics driver errors?

T61 - display flickers and gets green

Hi,
I have a one and a half year old T61. Since last weekend I have several problems with the display.
There flicker some lines and some rows in different colors, the display does not start at the upper left corner, and sometimes there is something like a green cloud at the bottom that gets bigger and fills all the screen. So normaly I can't see anything at the display.
Only when I rotate the display back and forward it sometimes gets into a normal mode. With an extern display everything is ok.
These problems already start while booting and showing the BIOS screen, so it should not be the operating system.
I'm not quite sure what really makes the problems. Is it the display it self or only the connection from the mainboard to the display? What could I do to fix this problem?
Greets, Baba

have you considered Thinkplus warranty, which is a post warranty warranty? It would be cheaper that way.
Alternatively, you can do it yourself, you can get the part from the net, and then follow this manual to change out the LCD.
http://www-307.ibm.com/pc/support/site.wss/migr-67980.html
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

MacBookPro5,2 mid 2009- display flickers and no contrast on start up

After low power shut down the display comes up flickering and looks bled out (as if the brightness is set way to high) Is this something anyone else has noticed? Is it a hardware problem I should be concerned about? Thanks
Model Name:          MacBook Pro
Model Identifier:          MacBookPro5,2
Processor Name:          Intel Core 2 Duo
Processor Speed:          3.06 GHz

Hi ammartq,
Usually such a beep code means there is a problem and this has nothing to do with preinstalled OS version.
So I agree with Tonny and I think you need professional help from an authorized service provider to get rid of this because the guys have professional diagnostic tools to check the hardware.
You can find a list of authorized service providers here:
http://eu.computers.toshiba-europe.com > Support & Downloads > Find an authorized service provider
Good luck! :)

IMac 27' Mid 2011 display flickering and going dark

Having bought an iMac 27' in may 2012 I was confronted with a flickering of the screen and the display eventually going dark for a certain amount of time.
Unfortunately the first level support wasn't helpful and the second level support rather rude.
Have taken the iMac to the seller I was told they would have to change the display for € 700,-. Apple would refuse to extend the one year warranty though other people have encountered the same problems obviously after checking in different support forums.
So did anyone find a cheaper solution then just to exchange the whole display? Having to spend half the prize of a new iMac can't be the answer.

Yes, the light comes back after a few minutes or half an hour.
Will try take a screenshot when the display is off again as soon as I get the iMac back from the workshop.
I have decided not to spend so much money on the replacement of the display for the moment. If the light goes off more often I will buy another display (probably a non-apple-product with a better warranty) and connect it to the iMac.
As much as I love the concept of the apple products and the idea of an All-In-One computer (it's my 7th apple in 25 years), I really disliked how they treated me as a customer with a valid complain.
If it just this little cable why would Apple replace the whole display? I'll check if I can fix it myself then.

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I have to press F5 to make the display visible everytime I boot up. I thought that it was a software related issue and I tried to format the HDD with original recovery CD. However, the screen keeps flickering from the BIOS stage.
Now, it is even worse. The screen is flickering when power up and I cannot log into Windows MCE after the HDD formated.
After reading the related articles and FAQ, I suspect it was a graphic card (hardware) issue.
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Appreciate your advice before I contact the local support team.
Thanks a lot!

Hi!
Thats a strange issue. Do you have the same problems on an external monitor?
If a display is flickering, the display itself is defective because the FL-tube is causing the error. I think the best is, when an ASP (authorized service provider) checks your Qosmio G30.
Here you can search for one:
http://eu.computers.toshiba-europe.com => Support & Downloads => Find an ASP
Good luck
Bye

I have a late 2009 imac i am having issues with my screen flickering and getting dark

i have a late 2009 imac 21 inch i am having problems with my screen flickering ND GETTING DARK DOES THIS MEAN THAT MY COMPUTER IA FAILING

I have partly the same problem (Sceen blackening) sparodically.
2010 iMAC with I7 CPU and ATI Radeon HD 4850 512 MB Graphics.
If I lower the brightness to around (3 or sometimes 4 of the on screen squares F2) the issue does not happen at all. I prefer a bright screen.
The issue commenced immediately after instaalling OS X 10.8.2 update one year ago.
The current software is OS X 10.9 (13A603)
The graphics on this computer are always first rate when working properly even at maximum brightness
There are particular days and times when the problem routinely occurs.
Some of my neighbors with iMacs have similar problems.
I live adjacent to the City of London in an area where new building seems to be developing faster than the various utilities and there are known Power Network issues. Professional surge supressors make no difference.
I live in a large property with four independent ring mais. The issue is present on all four rings. I have yet to take the computer elsewhere to possibly eliminate power issues from the problem.
I am reluctant to replace an otherwise fine top of range iMac which otherwise serves me well since the same problems might be present.

My display Flickers and system freezes; is there a solution?

Sometimes I get the three beeps. Sometimes it works fine for hours. Picking it up or moving or tapping it will also cause the system to flicker and stop. I dont have the install disc anymore to follow the troubleshooting procedure in the manual.

Make a "Genius" appointment at an Apple Store, or go to another authorized service center.
Back up all data on the internal drive(s) before you hand over your computer to anyone. If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

My download manager window opens, displays the dowloading file and then goes blank. I have to do a search of my drives to find it. I'm using Win 7 Ultimate 64

A couple of months back, I upgraded both my computers to Win7 Ultimate 64. At the time, I upgraded Firefox as well. The other computer works fine. This one however, is giving me a problem with the download manager. The window opens and shows the file being downloaded but as soon as the download is complete, the DL Manager window goes blank. I have no idea if the antivirus has time to check the file or not. I also have to do a system search to find the file. I also have no option to open the file or folder from the DL Manager window. This isn't a serious problem but it is very quickly beginning to irritate me. Any suggestions????

Make sure that you are using the '''"Remember History"''' setting as described in this article -> [[Options window - Privacy panel]]
Check and tell if its working.

Display backlight flickers and goes off

3000 2049 44Q
Backlight of my display flickers and goes off after some time...
Moreover is there any solution to overclock to overclock CPU

Hi-
Try switching the power adapters to see if the problem moves to the other display.
Of course, reconnecting/double checking all connections is a good idea.
Other than that, any references in Console/Logs regarding graphics driver errors?

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My display flickers and shuts off only when I first start up my Macbook Pro. I can open and close the lid to get it to completely shut off. Any ideas?

Hello shabbdaddy,
After reviewing your post, it sounds like the display flickers only when booting the computer. I would recommend that you read this article, it may be able to help the issue.
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Thanks for using Apple Support Communities.
Have a nice day,
Mario

How can I connect my MBA 11" 2012 to my Imac 21.5" mid 2010 as a display unit. Connected using a mini display port cable and this did not work. Any guidance welcome. Thanks. John

I bought a belkin mini display unit cable( new) and connected the thunderbolt port in the MBA ( 11" , mid 2012) to the Imac mini display unit port using this cable. Pressed the CMD & F2 keys on the Imac keyboard as required but this did not work. Should I try with another cable ? Should i try with a thunderbolt cable ( recommended by appple support ) -- but they too were not sure about this. Is the Mid 2010 21.5" Imac not able to function as an display unit? Any guidance would help and will be much appreciated.

Welcome to Apple Support Communities
Only the 27-inch iMac and Mid 2011 and newer iMacs can be used as an external screen, so you can't use your Mac as an external screen. See > http://support.apple.com/kb/PH11302
You can still use your iMac as an external display, using an application like ScreenRecycler

I want to connect my IMAC to TV with HDMI cable. I did it before going to Dispaly and Arrangments and then mirror. Now when I go to display I dont have to option of arrangements. Olny {Display and Color} pops up. Any ideas what happend to arrengements?

I want to connect my IMAC to TV with HDMI cable. I did it before going to Dispaly and Arrangments and then mirror. Now when I go to display I dont have to option of arrangements. Olny {Display and Color} pops up. Any ideas what happend to arrengements?

For the "Arangements" option to appear, the external display must be turned on with the correct input selected and connected to the computer. Then close system prefs, reopen, go to "Display" and "Arrangement" will be along the top.

Can I use my iMac with a thunderbolt connection as an Display for my new Mac Mini with thunderbolt ??

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If it's a 27" iMac. I don't believe Target Display Mode is supported on the 21" model. But not with a Mac Mini running Leopard. It would need to be running Lion.

Imac 21.5 (ver 10.6.8) Display flickers and it goes blank

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