Screensaver & screen brightness functions don't work

MacBook is about 6 months old. With screen brightness, the scale goes up and down but the brightness doesn't change until I scale all the way down; then it goes dark. When I hit the space bar to turn the screen on, the scale goes up but the screen comes on at full brightness.
With the screensaver, the system ignores my settings under Preferences and just goes dark at the set time without the screensaver coming on.

The Genius Bar determined that it's a faulty "inverter" and is replacing it.

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