IMac (Intel) :: 27 Inch - Screen Randomly Goes Off?
Jun 2, 2014
I have a 27" iMac. Just recently, the screen has begun to randomly shut off. I then have to squeeze the power button, followed by a click of the mouse. This will bring me back to my password screen. Sometimes, that would be it, other times, it will do it repeatedly, for no reason, and then settle down.
Just for those of you who are bound to ask me about my Energy saving settings: Computer to sleep – Never. Display to sleep – 15 min.
It seems to me that this could be a hardware issue, but just incase any of you have had any experience of something similar, I thought I would ask.
Info:
iMac, OS X Mavericks (10.9.3), 27: iMac 2.7GHz Core i5
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Jun 24, 2014
My MacBook Pro 2010 15 inch screen shuts off randomly. The whole laptop doesn't shut off just the screen. It calls it a panic but I have to hold down the power button to shut it off when this happens or it will stay on the black screen.
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Apr 11, 2012
I am running 2x2GB memory with 2.7ghz intel core i5 and lion 10.7.3. Just wanted to know what it is crashing
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iMac, Mac OS X (10.7.3)
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Apr 26, 2012
My 27inch iMac screen shuts off during screen saver and does not come back on unless restart machine?
Info:iMac, Mac OS X (10.7.3)
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Oct 20, 2009
Apparently there might be a way to convert the HDMI to a miniDV display.
Is this really possible?
Has anybody really achieved it?
What kind of cable/adapter do you need to buy?
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Nov 16, 2009
Supposedly this was fixed with 10.6.2
Anyone else still experiencing this?
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Apr 16, 2010
Does anyone know if it's possible to use a 24 inch iMac as a Target Screen? I know it's possible for 27 so there must be a hack or terminal command line that I can enter to achieve this.
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Feb 11, 2012
My iMac is one of the late 2009 models (bought Jan2010). My screen has started to flicker over the past couple of days. I have the correct screen firmware.
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iMac, Mac OS X (10.6.8)
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Mar 17, 2012
problem of getting black screen on imac running 10.6.8?
Info:
iMac (27-inch Mid 2010), Mac OS X (10.6.8)
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May 11, 2012
my imac is about 3months out of the box and a few days ago i went to turn it on and....nothing. i could hear the start-up chime and the mac clicking and making "doing" noises, also i could clearly hear the volume toggle up and down. That said, the screen remained, well, dead and just black.So, the first thing on my agenda for the weekend was to take my imac into the shop. As i was organising the equipment, i tried one more time to turn it on.It worked.For me, that's a bad thing as my mac may do this again. It was out of action for 3 days now it's back. So now i am on here.
Info:
iMac
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Sep 24, 2010
The screen randomly turns black without any major reasons. It doesn't seem to be a sleep mode/screen saver thing as the music continues to play on. I can adjust the volume or pause the music with the keyboard but the screen just won't turn back on. I have to shut it down using the power button and it happened several time the last couple days. Anyone else experience the same thing and got a solution?
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May 21, 2009
My lovely cat recently decided to walk around my desk while I was at work and knocked over my Imac, causing a large crack in the glass and the screen. I'm not technically capable enough to do the install of the screen/glass myself, but I was wondering what I should expect a repair from an Apple certified technician to run.
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Jul 17, 2010
A few months ago, i noticed what looked like a streak across the screen, but it wasnt on the outside, it was on the under side of the glass. Now, the streak is very visible esp in natural lighting. Its not noticable at night, because the screen light shines through it making it invisible.
It looks like dust? But im not 100% sure, but it has a directional pattern which leads me to believe its being causes by the inner fans of the system, and that there are some gaps where the air flow is constant. Also, the streak is in the upper left hand corner mostly (no where on the bottom poritions). Im assuming that the place holder at the top-backside of the iMac, for the exhaust fans to expell the heat from within, is what is causing this air flow.
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Feb 4, 2012
my screen is just randomly going dark. its not shuting down - just seems to go to sleep but nothing I do wakes it short of turning the power button off then on. When I do that it quickly comes on again and seems to work fine. Seems to be happening with more and more frequency and is not particular to any software. I've read the boards here - I'm not a gamer ( no games on this computer) I'm a photographer with lots of files and I use photoshop alot. Yesterday I was on you tube and my screen went dark again but the video was still playing - I could still hear it. In fact, I could hit my mouse to stop and start the video but I couldn't see anything. Hardware Overview: Model Name: iMac Model Identifier: iMac11,1 Processor Name: Intel Core i7 Processor Speed: 2.8 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: IM111.0034.B02 SMC Version (system): 1.54f36
Info:
iMac, Mac OS X (10.6.8), about a year old
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Mar 7, 2012
my screen keeps going black randomly but everything in the background is still playing. When i press the power button twice it will go to standby and then turns on again, but the black screen keeps getting more and more frequent. Ive tried resetting the SMC and the command+option + PR thing but nothing has worked.
Info:
iMac, Mac OS X (10.6.8)
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Jun 11, 2008
I have an inch wide white stripe that runs from the top to the bottom of my screen. This is on an Imac. The cursor disappears when going through it but pops out on the other side. It doesn't move but I can drag my window back and forth to view the part the stripe covers.
Any ideas or should I locate a local mac repair person?
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Aug 31, 2014
How do I turn off Ichat on my IMac 21.5 inch screen? Whenever I turn on the computer, the ichat screen just pops open all of a sudden?
Info:
iMac, Mac OS X 19.9 Mavericks
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Apr 9, 2012
I just received my 21.5 inch imac refurbished. It is the 2011 model. I really like it, but the screen seems to constantly be adjusting brightness...Almost as if it is "flickering every 5-10 seconds. It is extremely annoying, and I think I will have to return it to apple. So another two weeks of waiting for a computer.
Info:
iMac, iOS 5.1
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Mar 20, 2012
My Imac---which is less than a year old--randomly goes black but continues to function otherwise. This is happening on a more and more frequent basis.
Info:
iMac
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Oct 20, 2009
The new 27-inch iMac uses up to 365W vs 280W for the old 24-inch! (going by Apple's published max. power consumption numbers. I doubt they would lie because it isn't exactly favourable for them to put in falsely high numbers in an environmental report).
That means there's some extra beef behind the extra components. Perhaps the ATI 4670 is a bit overclocked and the 4850 runs a bit faster than the old iMacs? Admittedly that 2.8 GHz i7 is going to suck a fair bit of power - the recent 2.8 GHz i7 860 model runs at a 95W TDP, however, the quad core iMac isn't available until November. So it won't be using the i7 860, and my guess it is using another custom processor, something a bit more power efficient, somewhere in between the 55W TDP of the old iMacs and the 95W TDP of the i7 860.
The difference between the power consumption of the two computers is 85W. The old iMac had a 24-watt digital amplifier, this new one has two 17-watt amplifiers. That brings the delta down to 75W. Say the iMac's i7 processor has an 80W TDP. That now brings the delta down to 50W. The new display likely wouldn't increase power consumption because of the LED backlight.
I'm not sure if I'm missing much (OK, two extra RAM chips may use another few watts), but there is still a fairly massive 50W unaccounted for.
Just a bit of fat to chew on
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May 19, 2012
The screen blanks out randomly, everytime I need to turn into sleep mode and then wake it up again to turn the screen back
Info:
iMac, Mac OS X (10.7.4), mid-2011
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Jun 22, 2009
I just got the new 24 inch intel iMac yesterday and it was working fine until tonight. I installed Skype and as I was using it, the computer froze and said I had to restart. So I did that. It happened again, but this time, it wouldn't restart. It went grey and kept making loud beeping noises. I looked up what could cause this and it said that if the RAM was upgraded improperly this could occur. The problem is, I never upgraded the RAM. Its been working fine for the past day until now. What should I do?
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Sep 12, 2009
Does anyone know if the panel used in Apples 24 inch Cinema display is the same as the 24 inch iMac?
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Jul 29, 2010
Hello everyone, I'm currently looking to buy a 27 inch imac and can't decide whether to get a base i3 27 inch or a refurbished i5 quad core 27 inch. With the i3 I can get the student discount and qualify for the ipod, but the i5 is 23% off right now. Which should I get? Also is there a benefit of getting a 5 series graphics card over a 4 series graphics card?
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Aug 30, 2014
I have had this for the last few days, so I don't really know what's going on...
Anonymous UUID: D4B5793A-92CF-4E5D-33F8-94D77B084C5C
Sun Aug 31 00:07:39 2014
panic(cpu 2 caller 0xffffff8002c5220d): "zalloc: zone map exhausted while allocating from zone kalloc.8192, likely due to memory leak in zone kalloc.64 (1440851328 total bytes, 22513266 elements allocated)"@/SourceCache/xnu/xnu-2422.100.13/osfmk/kern/zalloc.c:2494
Backtrace (CPU 2), Frame : Return Address
0xffffff81348c3c70 : 0xffffff8002c22fa9
[Code].....
Info:
iMac, OS X Mavericks (10.9.3)
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Dec 7, 2014
I recently had to reformat my iMac because it was restarting constantly and it kept freezing too. After a reformat, I installed a few programs. Skype, Microsoft Office 2010, VLC, Plex Home Theatre, Plex Media Server, an uTorrent.
My computer restarted randomly again, twice :-( I included the crash report below if it is useful.
Anonymous UUID: D5BFA84C-1ECE-3EC9-ED1F-6392EF1A3BB8
Mon Dec 8 02:13:49 2014
*** Panic Report ***
panic(cpu 0 caller 0xffffff80040e8887): "complete() while dma active"@/SourceCache/xnu/xnu-2782.1.97/iokit/Kernel/IOMemoryDescriptor.cpp:3307
Backtrace (CPU 0), Frame : Return Address
[code].....
Info:
iMac (27-inch, Late 2012), OS X Yosemite (10.10.1)
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Dec 4, 2014
I set the screensaver to a folder on main drive. All files are jpg. it works for a while then after a few times - exit the screensaver then back to the screensaver - it will go to the default settings.
Info:
iMac, OS X Yosemite (10.10)
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Sep 23, 2009
hey my friend is having a problem with his imac when he turns it on he gets a grey screen and stops there. there is also a grinding noise near the back maybe the hd or disc drive? it grinds 10 times then stops then continues for a couple minutes and then he gets a question mark on the screen.
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Aug 21, 2010
I have 2 questions:1) I have a 2.GHz Core Duo CPU. I read that this model has a socketed CPU that can be replaced. Is this true?2) If yes, how fast can I go? Can I use the new Core i3 CPU?
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Aug 26, 2014
mac suddenly very slow especially safari
Info:
iMac (27-inch Mid 2011)
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