Microsoft wireless 4000
Screen saver mode, as you know, is entered when the computer senses no activity (including mouse) for a defined period of time. for some reason, the computer thinks there's been some kind of activity. If you have an extreamly sensitive mouse, vibrations could be being picked up "tricking" the computer into thinking there is activity.
The other possibility is that the computer might not be able to respond to the mouse if it went into screen saver mode (perhaps a preference setting with the wireless mouse) and has decided that while operating using a wireless mouse screen saver will be deactivated. Look into your preferences or settings relating to the wireless mouse.
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