iMac i7 screen flicker

I can confirm that this issue is not resolved with an update to OSX 10.7 (Lion)

Call tech support and request the Firmware update for the ACD. It will take filling out some paperwork, but it seems to have fixed my problem.

I too had the dreadded black screen off and on.

24" ACD 2011 MBP 2.2 Quad i7

Thanks for the reply MortgageGod.

I do have a case open with support, my system has all firmware and OS updates applied. Apple are working on a resolution. Until that is made available in a future update I have no alternative but to use my old monitors whilst the ACD collects dust.

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Message was edited by: MortgageGod

Ah right.

I haven't heard of a new patch from my support case guy yet. I will whiz off an email to my case manager to check on that. I ran some test tools they sent me and returned the diagnostics logs etc last week; I expect that there area few issues for specific monitor builds etc - hopefully the build that works for you will suit my setup too.

Cheers

This thread is about iMac flickering, not ACD. I got mine fixed. Took it in to my local Apple Store and they replaced the screen and brightness controller. Only problem is that took them a week to accomplish.

Yea I know, sorry. I figured that out when I answered my 2nd post, that is whay I deleted it.

Update:

It took the shop 15 days to get to my work order (part was in stock during this whole time), but they finally got to it and the problem is solved.

They replaced the display. Everything is good in the world for now (except the economy).

My 2011 Mini worked fine for 3 weeks, now flickering on startup for longer and longer periods until goes away.

Obviously a Lion problem, we'll just have to wait for Apple to fix it. If EVERYONE with a flicker called Apple support me thinks they'd get on it sooner than later.

I have this same problem -- intermittent flickering and once in a while, complete blackout.

I can still hear fan running (or even a DVD burning) in background, but cannot wake up the screen. Forced to "sleep" (power button) and then the computer will wake OK (however forcing the computer to sleep interferes with some operations so it is not a good solution).

This is my main workstation at the moment, so taking the computer in for a "fix" is not an option. I've been using the computer for about one year and until the past couple of weeks, this problem had NEVER occurred.

My 27" i7 iMac is mid-2010

Processor Speed: 2.93 GHz

Number Of Processors: 1

Total Number Of Cores: 4

L2 Cache (per core): 256 KB

L3 Cache: 8 MB

Memory: 8 GB

Processor Interconnect Speed: 4.8 GT/s

Boot ROM Version: IM112.0057.B00

SMC Version (system): 1.59f2

I have a mac mini server I bought yesterday experiencing this same issue. The flickering is driving me nuts. I finally started pulling cables and the such and found that getting rid of the apple connector and using a HDMI to DVI cable has seemed to stop the issue. It is too early to know if it is officially solved, but Ill keep you posted.

My flicker issue was on the 24" Apple Cinema Display (ACD) when using them on thunderbolt ports.

Apple were able to identify the issue on my machine and created a firmware update for the ACD which has completely resolve the problem for me. If you are using an ACD on thinderbolt and are having flicker issues I'd recommend contacting Apple Tech Support to see if you need that monitor firmware patch.

I am having the flashing problem, too. Very irritating. It's like having someone take a flash photograph of me right into my face. I've scheduled a phone cal from tech support for tomorrow.

27 " mid-2011 iMac

AMD Radeon HD 6970M 2048 MB Graphics Card

running Mac OS X Lion 10.7.3

Hardware Overview:

Model Name: iMac

Model Identifier: iMac12,2

Processor Name: Intel Core i7

Processor Speed: 3.4 GHz

Number of Processors: 1

Total Number of Cores: 4

L2 Cache (per Core): 256 KB

L3 Cache: 8 MB

Memory: 16 GB

I didn't have the flicker, but a flash (see my post above). I just had a call from Apple Support and we did the following: We did:

1. A PRAM reset: Power off the Desktop. Unplug the power cord from the bag and wait a couple of minutes. Re-plug in the Desktop. Immediately after pressing the "on" button, Hold down the following keys: "option," "command," "p," and "r." Continue to hold them down until you hear that third chime tone. Then release them. Shut the machine down again and re-boot normally.
2. Open "System Preferences" under the Apple icon at the top left. Go to "Users & Groups." Click on your name, and then choose the "Log In Items" tab. Unclick everything that you don't want to open or activate upon your start up.
3. Because I was experiencing the flash mostly when I was on-line using Safari, the Apple technician suggested that if I continued to have difficulties, I should go to the Safari menu and click on "reset Safari." Unclick everything except "Save Name and Passwords" and "Remove other Auto-fill Text." then hit OK.

So far no flashes! But its only been a few minutes