A couple of questions -
Is MA3 coming up automatically as a screensaver, or are you launching it manually?
If it's coming up automatically, are you absolutely sure that it's the latest version that is running (look at the version number in the About box).
Regarding DirectX programs using up all the clock cycles - that can sometimes be true, but if MA3 is set to 'Limit Frame Rate', then it usually uses less than 10% of the CPU time.
I just tried setting MA3 to come on as a screensaver after 1 minute, and the monitor to shut down at 2 minutes. It worked perfectly. (Using Win 7).
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