Strange colorful vertical lines when opening vlc or skype (video)

Well, this is my first post, and I am writing it because of a problem i encountered with my iMac (late 2008 model 20'', 2.4 GHz).
The problem is:
When I am video-calling on Skype, after a while the top left corner of my dock icons disappears... After some minutes my iMac display freezes with these vertical lines, usually green. The paradox is that I can speak to my skype buddy for some minutes but eventually it freezes completely and the only solutions is to turn it off by pressing the power button for six seconds. In the condition of the lines I can't sleep my iMac by pressing the power button once. The Same Problem I have when using VLC. Some more information: when the top left corner of my dock icons dissapears, if i sleep my mac and wake it, it reappears. I have read in other discussions that the problem with the disappearing corners of the dock icons has to do with the UI of the operating system. So I Am Asking, do you know what these vertical green lines are, if anyone has the same problem? How can I fix it? I believe that it has to do with the operating system or the UserInterface! This problem does not appear in a PowerBook G4 with PPC inside. I think is an Intel-based problem!
Last note: These lines are moving very slowly from left side to right side of the screen!
I had this problem when running on 10.5.5 and 10.5.6
Any Help is welcome!
I take two pictures of my iMac in this state and i want to share it! I Don't know how....
Message was edited by: Averello

- iMovie HD 6.0.3 renders jaggy and flickery still images when sending them to tape or iDVD
http://www.sjoki.uta.fi/~shmhav/iMovieHD_6_bugs.html#jaggystills
Could it be this?
Sue

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