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lately the screen on my macbook pro 15" (late 2008) has been blinking intermittently. i have never noticed this before, but it has been happening regularly over the last 2 days. i have a 2.4G late 2008 MBP, core 2 duo, running OS 10.5.8.
It's an issue with the nvidia graphics cards. Switching to the other card will fix it. You'll need to contact Apple about it. It's a known issue but they are currently pretending that it's acceptable behaviour in a premium laptop.