Freezing and Video Artifacts on Startup

My IMac appears to be exhibiting problems similar to others that have been posted. I was hoping someone could confirm this.
I am using the new Aluminum IMac, 2.4GHZ 20". I purchased in late August. I installed 2GB ram shortly afterwards. System Version: Mac OS X 10.4.10 (8R4031) Kernel Version: Darwin 8.10.3
The machine was fine for two months. Then on 10/23/2007 upon login i would have graphics artifacts such as centimeter thick white/black speckled bands on part of the screen and windows that appeared smudged, though this is not always the case: there may be no screen or no artifacts. Usually freezing happens after logging in, although artifacts can be present on the login screen. Other times the machine loads to the point of showing the dock and the HD. After login, the machine at this point is unresponsive.
Apple tech support had me power down the machine, reset the system management controller, reset the pram, and repair disk permissions. At this point the machine is ok to use, but the problem is recurring. The machine will be fine for a couple of days, then I need to redo the process.

What more do you need than the 1000 posts already here on the very same subject?
Just read through the existing posts and you will find all the confimation that you need. There is no permanent solution to your issue although there are some workarounds that may or may not help depending on your use. Just look for titles with the word "freezing" in it.
Here is a link to one thread.
http://discussions.apple.com/thread.jspa?threadID=1131571&tstart=0

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