Glitch with desktop icons including cursor

How to describe it? How to get rid of it?
Let's see - on my iMac desktop in Finder. Desktop icons including dock icons, pull down menu words and the cursor are covered by a square shadow of "bits" that look like rows of lines. A folder icon on the desktop is covered by a rectangle approx. 1.5" wide and 1" high. It's composed of approx. 12 rows of lines across and 6 rows of lines down. Particularly annoying is the square of lines that is attached to the cursor. This square goes along with the cursor.
Has anyone seen this before?
It's a glitch that could be a bug of some sort or have I made a change in Preferences that I didn't notice?
Any help is appreciated!

At the Apple Icon at top left>About this Mac.
Then click on More Info>Hardware and report this upto *but not including the Serial#*...
Hardware Overview:
Machine Name: Power Mac G5 Quad
Machine Model: PowerMac11,2
CPU Type: PowerPC G5 (1.1)
Number Of CPUs: 4
CPU Speed: 2.5 GHz
L2 Cache (per CPU): 1 MB
Memory: 10 GB
Bus Speed: 1.25 GHz
Boot ROM Version: 5.2.7f1
Sorry to say it sounds like a Video Card.Logic board problem.

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