What does it mean when the screen flickers and flashes after 20min. of working fine? I have a Macbook Pro 17" screen and it's the late 2008 model

I am having trouble with a Mac book Pro 17 inch late 2008 Notebook.
When I turn it on and booted up it goes to desktop and everything is fine for about 20 minutes then after 20 minutes the screening starts rapidly flashing and flickering and everything on the screen locks up including the mouse becomes frozen.
What does it mean when this happens? Is it an issue with the monitor screen or is it some other internal hardware issue?

Run an Apple Hardware Test (extended version):
http://support.apple.com/kb/ht1509
Ciao.

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