No keys work and can't shut computer off

My computer just quit functioning properly tonight. The battery is charged, the screen lights up appropriately, and the mouse moves (but when I click, nothing happens It is stuck on "Mail" at the top of the screen but I can't quit by any of the usual ways. I can't even turn off the computer with the power button or by any other way. I inserted the Install Disk that came with the computer, hoping I could restart with. However, I hear it spinning but the icon doesn't show on the screen. (Computer is about 6 months old.)

Press and hold the power button for about 5-7 seconds, this should turn the machine off, if not remove the power lead and battery to power it down.
Re-insert the battery and power lead then perform a Parameter RAM reset on the restart i.e. press the Power button then immediately hold down the apple/option/p/r keys and wait for three chimes before releasing them.

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