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Since upgrading to 10.4.8 the other day the screen saver on my iMac has failed to come on. I have changed settings on it, made sure nothing was running that could have interfeared with the screen saver (iTunes, QuickTime, etc) and can't figure it out. When I move the mouse to the screen saver hot corner, it works fine, but it doesn't come up at it's set time. Currently I have the screen set to dim at 5 minutes and the screen saver to come on at 3. The screen dims but the screen saver never comes on. Any ideas?