Coloured stripes

this problem is random and happens 30-40% of the time.
after waking from sleep or after boot i am getting a screen filled with coloured stripes. i am unable to see the desktop or the mouse pointer but from using the apple remote i can tell that the system is working ok as i can get itunes to play.
there is nothing connected other that mouse and keyboard and it happens regardless of what programs are running.
putting the monitor asleep again and waking using the monitor power button does not work, only shutting down and leaving for a while makes a differance.
is this a graphics card problem?

sounds like the graphics card has overheated and died. best to get a replacement
I used to have this problem on other machines and it does bare all the symptoms.

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