Graphics problem: pixelated articles all over the screen?

I've been getting this on the odd occasion lately.
http://img131.imageshack.us/img131/7537/picture2smallfb8.png
When it happens the whole machine goes dead, no screen-capture possible, which makes me think it's a hardware problem, and you need to hard reboot. Sometimes it just persists through the reboots, too.
I'm on 10.5.5, the Intel Core 2 Duo 15'' model from about mid-07. GeForce 8600M GT card in it.
I imagine it's a fairly common problem since I've seen it mentioned elsewhere (although without adequate explanations/fixes), indeed that isn't even my image.
Ideas please? I'm going abroad shortly and don't want my MBP to die in foreign lands where I can't get her help.
Message was edited by: Lord4Bz

+Ideas please? I'm going abroad shortly and don't want my MBP to die in foreign lands where I can't get her help.+
Well, best guess is it's a problem with:
the graphics chip itself
the motherboard
the lead from motherboard to screen
If one or more of these is causing problems now I'd let Apple take a look at it before you travel ...

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Graphics problem: pixelated articles all over the screen?

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