Currently Being ModeratedSep 8, 2012 10:30 AM (in response to Richhep)
Just got a new Mac Mini replacing an older Mac Mini, connected to an Apple LED Cinema Display. The mini displayport connects to the new thunderbolt port, have now been getting flickering, on and off, and wierd display glitches. This seems to have fixed it:
This Cinema Display Update fixed it for me
LED Cinema Display (24-inch, Late 2008): Intermittent flicker while connected to a Thunderbolt port
Now I just need to figure out why the new Mac Mini wakes from sleep on it's own...just like the last one did!
Currently Being ModeratedSep 10, 2012 7:48 AM (in response to hummerchine)
That download link gets posted every so often on this thread.
It helps some people; others not. Including me.
Depressingly enough, Mountain Lion has introduced a whole new set of problems for dual display setups: randomly switching the arrangement, for example. Staggering. They just don't seem to care.
Currently Being ModeratedDec 8, 2012 7:26 AM (in response to hummerchine)
The latest firmware update posted above appears to have fixed my black flash problems. I connected the display to a thunderbolt Mac to install the update, but I use it with an ATI graphics card and display port and havn't seen any black flash yet.
Currently Being ModeratedJan 21, 2013 7:22 PM (in response to Richhep)
My Oct 2010 27" Cinema Display used with a 2011 17" MacBook Pro (ATI 6750M) had brief flickers to black for about a week and now it just goes black and stays black. Picture is good when it's on. When it goes to black the mouse plugged into the monitor still works on the laptop and the laptop is still charged by the power adapter.
I can unplug it and it will work for a few minutes, then cut out again.
Worked fine until now. Pretty bummed. Babied. Sat unmoved on a table for its short life.
Currently Being ModeratedFeb 15, 2013 8:59 AM (in response to Richhep)
my brand new, high end mac mini is essentially unusable with the display flashing. Why does Apple continue to sell a piece of equipment that is clearly defective - whether it is hardware or software?
Currently Being ModeratedApr 14, 2013 6:00 PM (in response to Richhep)
Last week I brought my 27in iMac in for a new hard drive.. Mine was recalled so they replaced it for free. They also said the fan needed to be replaced so I went ahead and paid for that to be fixed. I turned my iMac today and I am getting random black screen flashes. Sometimes it happens every 5 mins, sometimes it happens every 30 min or hour or every few hours. I am extremely upset because my iMac was working perfectly before I brought it in and had it repaired.. I made a genuis bar appointment for friday because I work all week and I need the computer. I also wanted to wait a week so I can record how many times it does it while I am on it and using it. But I am sure there isnt a solid yes or no if its going to be fixed.
Is there anything you all can reccommend doing before I bring it back in?
Currently Being ModeratedMay 10, 2013 6:00 PM (in response to Richhep)
I just solved my problem. 27" iMac with 30" cinema attached via dual link DVI. My problem started for the first time today at the moment I plugged a USB flash drive into my cinema display. The monitor started flashing black every second or so. I tried all the usual fixes (reset SMC, unplug and replug cinema display, reboot etc.) none of which worked. Going on a hunch that it might be USB related, I used compressed air to clean both the usb ports and plugs that were plugged in as well as my thunderbolt port and the mini display port plug from my adapter that was connected to the iMac.
BINGO, problem solved and a lot of money saved!
I'm convinced this was a USB related problem.
Hope this helps someone.
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: 12 GB
Boot ROM Version: IM121.0047.B1F
SMC Version (system): 1.72f2
AMD Radeon HD 6970M:
Chipset Model: AMD Radeon HD 6970M
PCIe Lane Width: x16
VRAM (Total): 2048 MB
Vendor: ATI (0x1002)
Device ID: 0x6720
Revision ID: 0x0000
ROM Revision: 113-C2960K-152
EFI Driver Version: 01.00.507
Display Type: LCD
Resolution: 2560 x 1440
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Connection Type: DisplayPort
Display Type: LCD
Resolution: 2560 x 1600
Pixel Depth: 32-Bit Color (ARGB8888)
Display Serial Number: CY9030CNXMP
Adapter Type: Apple Mini DisplayPort To Dual-Link DVI Adapter
Adapter Firmware Version: 1.02
Currently Being ModeratedJun 13, 2013 7:02 AM (in response to Richhep)
POSSIBLE NEW INFORMATION
Maybe this can be used for troubleshooting.
I've had this issue for a few years on this 2010 23" Cinema. The logic board was replaced at the local Apple store with no resolution.
Occasional flashing to black, non-rhythmic, maybe twice a second.
A 'second phase' with multi-colored snow added to the flashing.
I haven't had the issue for a few weeks. Yesterday our air conditioning needed to thaw out from being frozen up and was turned off. The temperature in this home office was 80-85 degrees. The monitor flashed all day long, non-stop. This Mac Pro doesn't get turned off, the display isn't allowed to sleep, and the mac isn't allowed to sleep. Today the air is fixed, it's 73.3 degrees in here now. No flashing.
Could it be temperature related? Could peterfrommilton above this post simply have cleaned out the cooling pathways with the air blasts?
Currently Being ModeratedJul 2, 2013 5:58 PM (in response to Richhep)
More possible information: I began having the flashing to black on my 24" Apple Cinema Display today when I connected the display to the Belkin Thunderbolt Express Dock, which I attached to my early 2013 MacBook Pro Retina (13-inch). When I move the Displayport connector from the Belkin Dock to the remaining Thunderbolt port on the MacBook Pro, the flashing stops, and the display is rock solid as always. (The audio and USB connectors from the display remain connected to the Belkin Dock.)
I tried swapping the Thunderbolt cable (between the dock and the Mac) and the Displayport connection between Thunderbolt ports on the dock and then on the Mac, with no effect. So it seems that it's not the particular port.
This is my second Belkin Thunderbolt Express Dock in a week. I exchanged the first because it was tripping the circuit breaker for this particular circuit in my house. I've been hesitant to apply the firmware update because of the warning that I should only apply it if I have a flicker. I think a flicker is different from the flash to black that I'm experiencing. And the problem goes away when the Displayport connector is plugged directly into the MacBook Pro.
What could be causing this?
Currently Being ModeratedAug 5, 2013 11:26 AM (in response to Richhep)
Experiencing same issue 30" display with mini-display to dual-link DVI adapter. Connected to 1st gen 15" MBPr (MacBookPro10,1) 2.6GHz with 8GB ram.
Simalar to original description: Non-rythmic, minutes-days between flashes, sometimes 2 flashes in a second, confusing...
Currently Being ModeratedAug 5, 2013 12:05 PM (in response to ninjadude9)
I retract my previous comment. My problem seems to fall under this instead:
But I'm glad my display isn't dying...
Currently Being ModeratedOct 10, 2013 7:59 PM (in response to Richhep)
This is for FYI as I'm going to talk to a genius about it.
I'm wondering if this is some sort of software problem.
It first happened yesterday when I was using Intaglio, a vector drawing program. I switched to another layout & suddenly I had rapid black flashing. I could see the program under it between flashes. The flashing stopped when I quit the program.
Then I rebooted the program & opened another much bigger file & it was OK. Nothing I did triggered the effect. When I opened the original file, the same thing happened.
I rebooted the mac, and although the file opened OK, it appeared to have been corrupted, as it would no longer accept changing fonts. I began a new file & copied & pasted the data into that which remained stable re fonts. I then deleted the corrupted file.
Today it happened again this time with Safari. I logged into my ISP account & as it opened a page with an animated usage graph the flashing began. Again, quitting stopped the effect.
My mac mini is 2 months old & is the i7 model running OS 10.8.3, with 16GB of Kingston RAM I installed. The display is an Apple Cinema & is about 8 years old.
I'm not running anything Thunderbolt, except the display via that dongle, have no other USB peripeherals attached that were working at the time.
I will add I've had some other odd things happening with the mac. Maybe it's the OS?
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