IMac :: Random Artifacts / Glitches On The Screen?

Sep 15, 2010

I've had my 27" iMac (3.06GHz) for a few weeks now and yesterday I noticed some weird artifacts appearing on the screen, very randomly.

They will pop up all over the screen but if I "Show desktop", they will go away for a bit but sometimes reappear again in different areas of the screen. I restarted the computer but that only temporarily fixed the problem.

Anyone know what's causing this and how to fix it?

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Feb 4, 2009

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Sep 6, 2010

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May 11, 2009

I have an iMac G5 (rev. B with ambient light sensor) which has suddenly started having a problem where the entire screen is covered with pink artifacts. The iMac had been left on overnight and when waking up in the morning I found the screen looking like this and now it continues to stay like this no matter what I do. I have attached a screenshot and was wondering if anyone might have a clue what has caused this to happen

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Aug 7, 2009

I have a 24" 2007 iMac, the first aluminum ones, 4Gb of Ram and a recently upgraded HD to 1Tb (from a 320Gb failed drive). Recently, I have noticed that under some active usage, such as playing World of Warcraft or Excel, the screen will start to turn completely off for 10 seconds, and then back on for 10 seconds. It will continue to do this for about 3 hours, turning on and off every few seconds or 15 seconds. It will mostly turn completely dark but would also sometimes flicker. The curious thing, is that if I continue to keep playing, the screen would cease doing this after about 3 hours and then be completely normal and fine, but the next night.

The symptoms would repeat itself, and would consistently go away after active usage (3 hours or so). Imagine this, as if the iMac itself needs to be "warmed up" for 3 hours before normal usage. It would also appear that if I hit the machine (or tap it), this may sometimes bring a dark screen back to life for a few seconds. I plan to bring it to support, but I just want to get some ideas from you guys as to what this can possibly be.

Some of my guesses:
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2) It could be a loose connector from my recent transportation of it while upgrading my HD, but then why would it become normal after 3 hours of usage?
3) Maybe something to do with RAM or video RAM? It is faulty, and thus only prolong heavy usage would "run it in" for the session? After not using it for a while, it goes back to its failed state?

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Sep 24, 2010

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Feb 16, 2010

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Here are some screenshots so you can see what I'm on about.

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Sep 18, 2009

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Jun 10, 2010

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Mar 7, 2010

I'm gonna apologize in advance if this was already posted, but I'm not quite sure what the technical phrasing for this issue is, so I could've missed it in search. I'm running a Macbook Pro 17', manufactured around September 08. It's currently running OS X 10.5. I received it from my school with the computer already set up and all the software pre-installed, so I personally don't have access to things like the boot disc and other base software, but I can get a hold of it if it's necessary. The crash: Somewhere along the boot-up process, or somewhere soon after boot-up, the computer will freeze and a bunch of pixels will rearange themselves. I wish I could show a screenshot, but the best way I can describe it is that these little jagged stripes of pixels will move to places they aren't supposed to; for example, below the little spinning boot-up circle on the initial boot screen, there's a block of pixels kind of shaped like --.--_ that pulses darker and lighter in time with the pixels on the bottom of the circle, so they just seem to be transposed from another position on the screen. If this happens during boot-up, which is most of the time (on the screen with the dark grey apple on a light grey background), then the computer will try to boot up for a while, then the artifacts will run in stripes down the screen and a window will come up telling me to restart my computer. Sometimes--usually when I've shut it down and taken out the battery and let it sit for a while--it'll get past boot-up, and I'll get either almost to the desktop or even get a couple minutes of actual use before the artifacts appear again and the computer freezes.,......

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Mar 13, 2012

when i move documents to desktop my screen glitches and the screen goes really weird. will apple cover it. it is only 6 months old.

Info:
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Aug 20, 2014

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A shot of the artifacts is here: [URL] ...

The distorted window is here: [URL] ...

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Aug 12, 2009

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Jan 5, 2011

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Two updates released Wednesday address issues with the 27-inch big screen iMac, released in October 2009.

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The 2.1MB update is available for download from Apple. It requires Mac OS X 10.6.3 or later.

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Jun 27, 2012

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I have never witnessed anything such as this on a Mac before, so I'm completely at a loss. It's hard to replicate this problem, as it seems to be totally random--sometimes it'll happen when coming back from sleep, but more often, it just happens in the middle of regular tasks. While I'm using the computer, the screen will suddenly go black for several seconds, and I simply have to wait for it to return.

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Jun 7, 2010

It is random and is only across internet windows, not the entire screen.

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appears randomly.

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Jun 6, 2012

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Energy saving set to - Hard disk never sleep, Screen sleep in 15 mins.

Info:
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Feb 2, 2010

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Here are some more facts:

1. Setting a lower resolution doesn't rid me of the green fuzz effect.

2. If i connect to the same monitor using the single-link DVI port, everything works great, but only reaches 1920X1600 (as expected).

3. Connecting to different monitor using the Dual-Link DVI port works fine, albeit that the other monitor has a lesser max resolution.

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5. I've attached a screenshot of what this looks like.

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Info:
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