Line of "dead pixels" on the screen that come and go.

I just did a clean erase and install, i'm using leopard with all the current updates. i noticed the system was leaving lines on the screen before the fresh install so i figured it was a software problem. well, after doing a clean install they are back. its like the video isn't processing correctly or something because i can put another window on top of the "dead pixels" and it covers them up, like the in this picture. http://farm4.static.flickr.com/3269/2442796153fb66961090o.png
the finder window is covering an inch or so over the dead pixels. and to clarify the line of dead pixels or what ever they are appear to associate with a certain window or app and show up at different parts of the screen. for instance, if i see the lines in firefox, i can minimize the window and the line is gone.
this is on a 24inch white imac with the 2.16 c2d.
any ideas what would make this happen?
Message was edited by: DagYo!

There are quite a few posts about this sort of thing.
Many peopel find some minutes to hours after the lines of pixels the Mac freezes - mouse still moves but you can't do anything.
It's not clear if it's software or hardware.
My suspicion is that it's a software problem but I may be wrong. Either graphics memory or RAM used for buffering is faulty, or something is inadvertently writing garbage to graphics memory.
Most people attribute the issue to Leopard, but I'm still running Tiger.
Lots of posts about it being an nVidia card driver issue, but I'm running ATI.
Maybe coincidence but my 20" late 2006 iMac started playing up after a security update earlier this year.
Some people have had graphics cards replaced and it's cured it, pointing at hardware.
Another thing that seems to help is upping default fan speed using say smcFanControl.
Two things that have made this less frequent for me are:
- turning off Genie effect in Sytem Prefeerences for minimising/maximising windows (I often got freezes when changing windows)
- running smcFanControl
There is some debate as to whether or not for some reason the fans are not speeding up properly (software/EFI or SMC problem?) in response to higher temps and hence components are becoming unstable.
Try some searches on 'glitches' or 'freezing' or browse through the last couple of weeks threads.
If your machine is under warranty I'd be phoning Apple. Mine alas is not.
AC

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