Video Glitching- Lines and Patches on Screen

Hello.
This morning my three-year-old iMac G5 began exhibiting video glitches. The glitching occurs at all times, including the gray bootup screen. The display appears to be streaked all over with coloured lines which change colour and pattern when I move windows and objects around on the desktop.
http://www.gossi.co.uk/misc/screenjpg.jpg
An additional strange symptom is that this first occurred when I started up World of Warcraft. Now the above behavior occurs at all times with or without WoW running. 3D graphics in WoW are highly distorted, stretched and blocky.
I am aware of the iMac repair problem, although my serial number does not match up, and my iMac is second generation rather than first.
This seems very unusual, and doesn't seem to match many other graphical problems mentioned on the forums. Has there been any other issues similar to this reported?

To Apple Discussions!
"An additional strange symptom is that this first occurred when I started up World of Warcraft."
Are you playing this game off of a CD/DVD or is it installed onto your HD?
Which OS are you using?
*A couple of things to try prior to visiting your local AASP:*
Max out your RAM. Your system info confirms you only have 1GB.
Boot from your System Install DVD & run the repair disk/permissions option(s). If this works, then I suggest that every time you play WOW, afterwards repair permissions directly from the HD & restart your computer. However, you really should consider maxing out your RAM.
Mac OS X 10.4 Help-My Dispay Doesn’t Look Right
If the above is of no help then you will need to do the following:
System Preferences>Display>Display
Check the Colors & Brightness settings.
My Color setting is set to Millions which I believe is the default setting.
Now click on the Color button.
Check Display Profile
Is Show profiles for this display only enabled or disabled?
If necessary click on the Calibrate button & do the necessary.
Now in the bottom right corner, click on the purple button w/the black ? mark in the middle. This will bring up the help window.
Midway down, click on the Colorsync Utility link.
The next window should be Profile First Aid.
Read & follow the instructions/details of About Profile First Aid: & do the necessary to Verify & Repair.

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