I am getting blocks of black, vertical broken lines to right of cursor, around applications on desktop and over text on internet. I recently updated from OS X Tiger to Leopard on my G5 powermac. Can anyone advise how to get rid of the blocks of lines?

I am getting blocks of black, vertical broken lines to right of cursor, around applications on desktop and over text on internet. I recently updated from OS X Tiger to Leopard on my G5 powermac. Can anyone advise how to get rid of the blocks of lines?

What graphics card is installed?
Have you looked inside to see if the interior is dusty?
Is the graphics card dusty?
If equipped, is the fan on the graphics card turning?
Leopard uses the graphics card harder than Tiger, so weakness in the graphics card is more easily shown.

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