Screen flicker when the CPU is working

My macbooks started to flicker when the CPU is working, I'm using bootcamp and it doesn't seem to flicker when im using Windows XP.
Anyone had the same problem or got any ideas on what I should do?
Thanks
Macbook Mac OS X (10.4.6)

Interesting... I see a few possibilities of what could cause the problem:
1. It could be a software issue. I can get mine to stop doing it for several days by making a setting change in System Preferences > Energy Saver. After several days, it starts doing it again.
2. It is hardware, but not the screen. It could be some component that controls the screen brightness. However, it does not start when I dim the screen with the F1 key on the keyboard. So it may be something with the power management logic hardware.
I have the feeling it is in software, judging by the fact that your screen replacement did not fix the problem, combined with the observations I have made with my own MacBook.
Don

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Screen flicker when the CPU is working

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