IMac 21" late 09: Slow, screen flickering/tearing and odd behavior - the problem that puzzles everyone

PLEASE HELP!
My iMac 21" late -09, started acting a bit wierd a year ago. Things got worse rapidly, it got slower, the screen flickers/tears (see link below), short moments of lost internet connection, lost connection whit the keyboard (might be keyboard that is broken), almost overheats when gaming and odd behavior on some webbsites whit galleries and/or videos.
Let's begin whit the screen: it's not vertikal lines or major distortions, just a subtle horisontal line that "wanders" from bottom to topp and some lagging from time to time. Looks like this: http://cl.ly/3i2W2o3S1D2T
The wierd thing is that hi-res does not mean more "tearing". Yes the lagg and risk of tearing increases, but the connection seems to be: lots of movement=tearing. So a pixeld 240p video of people dancing can be way worse than a news debbate in1080p!?!
Lost connection whit internet and keyboard rarely happens and is probably due to something else, but thought that was good to have in mind.
Odd behavior: galleries ex: when browsing images on Facebook in fullscreen, the image sometimes jumps around in the beginning and when clicking on next the same picture might appear again or just nothing at all. When scrolling down overwiewing a gallery, the updating stops and you can't scroll down further. This problem appers mainly on FB, deviantart also acts a bit wierd but there is often small issues whit image sites. Doesn't help to switch browsers either!
Videos: Youtube is horrible to use, stops loading, dosen't start loading, erases everything loaded (grey bar disapears and reloads), refuse to switch ressolution and suddenly stops the video like it was done! "ehh.. wasn't this 2min long? Not anymore, now its 34sec!". Mainly a Youtube problem but many similar sites can be a bit problematic to use.
NO, it's not the HTML-5 problem or any standard flash issue and using a different browser dosen't help!
Worst is the fact that most of these errors are not constant! One day your watching youtube or mabey a movie in VLC, a bit laggy, but almost no problem. Next day **** brakes lose and after 2hours of struggling you are ready to stabb yourself in the face!
What i tried: Most easy buggfixes that might cause the above problems, updating most things, Switched from OS X SL to OS X ML, complete reinstall and some things i probably forgot by now. Then went to MacStore for repair, they didn't find anything wrong and said it worked fine after the standard diagnostic/repair program!?! Went home and everything was the same! Went a second time to MacStore, same result.
So I'v reinstalled a few times and it seems to improve the Mac. But 2-3weeks later every error is back, even if I barely installed or downloaded anything!?!
Any idea what this could be? Or is the graphic card broken and MacStore has a blind, inbred muppet as a technician?

No I didn't. The first time i explained the problem thoroughly and thought that they just couldn't miss such a visual error. I was wrong. The second time the technician wasn't there so i showed the above clip to the salesstaff and explained everything onceagain. Later the technician called me and we talked for 10min.
Btw, the problems always "manifests themselves", just varies between strenght and frequence.
But all other issues aside, what could cause the tearing of the screen as seen int the above clip?

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New iMac 27inch screen flickering/tearing/shutoff (continued)

This thread is a continuation of [New iMac 27inch screen flickering/tearing/shutoff|http://discussions.apple.com/thread.jspa?threadID=22 12682]. The thread was becoming too long and was causing some browsers to time out. The older thread has been locked.

citrus101 wrote:
Hi Brett L,
thank you for the coordination of this helpful thread. Are you Apple? If yes, please allow me to ask you three questions:
1) The Display Firmware stopped for over 90% the flicker issue, but what has this Firmware changed exactly?
2) Is Apple preparing a fix for the yellow tinge?
3) When will it be save to buy a new iMac?
Thank you for your efforts.
Hello Citrus.
Excellent questions.
I hope that Apple will authorize Brett L. to provide us with some clear, honest answers to them . . . although, as I pointed out before, it would seem by the latest messages that have been posted in this thread -- that is, the *original thread* -- that through their actions, Apple has already provided us with their answer -- and solution -- to the yellow tinge issue; and that is the replacement of the LCD panel.
As to what the most recent display firmware update did, I am doubtful that Apple will allow Brett to reveal that kind of information, but we can be hopeful.
As far as when it will be safe to purchase a new iMac, I seriously doubt that Apple will say anything which would suggest that it is not safe to purchase a new iMac now. What company is going to say "Don't buy our product now. It's not safe"?
For my part, I have now contacted Apple regarding the issues that I am having with my 27" iMac, and I will wait over the next few days to see how things play out. Based on the testimonies of others here, I don't expect Apple to disappoint. I have the confidence that they want to leave me a satisfied customer who will continue to purchase their products in the future.
Message was edited by: Warren Beasley

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Click the red button in the upper left corner to quit the application.
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IMac 21" late 09: Slow, screen flickering/tearing and odd behavior - the problem that puzzles everyone

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