1 Reply Latest reply: Sep 28, 2011 6:12 AM by a brody
Hans Eklundh Level 1 Level 1 (15 points)

I have a brand new iMac 27" 3,4 GHz Intel Core i7 with 16 GB RAM and AMD Radeon HD 6970M 2048 MB. I have two 23" Cinema Display connected via two Displayport/Thunderbolt ports.


I have discovered small red dots fluidly appearing on the screen (only visible on dark background). They come and go and apperas in a repeating linear pattern.

What might be the cause of this?




I hope you can see them on the enlosed image, maybe click to enlarge.

MacBook Air, Mac OS X (10.6.7), 2,13 GHz Intel Core 2 Duo, 4 GB RAM
  • a brody Level 9 Level 9 (64,350 points)

    What you may be seeing is what is known as sleeping pixels.  Since it is a brand new machine, see if the return/exchange policy lets you get a replacement free, or if you might want an exchange under warranty.  If they go away and don't bother actual images, I wouldn't worry about it.  Sometimes if you very gently rub a sleeping pixel, it will go away quicker.  But do not press too hard as that may damage the screen and void your warranty on it.  So be careful!