Why when powering down Mac does screen darken & prompts me to power down?

Not sure if you can see this or not - but, when I turn my computer off through the apple menu, the screen is suddenly glassed with a dark film and a gray box comes up in the middle of the screen that reads:
"You need to restart your computer. Hold down the power button for several seconds or press the restart button"
Then I have to press the power button in order to turn the computer off!!! ANY IDEAS????

Yep that's a kernel panic. That's not good. It usually means something is screwy with the hardware. Do you have Techtool if you bought applecare? It can check the hardware of the computer. Either that or start up from your Leopard DVD hardware test by holding down d at startup. If you hold down c at startup with the DVD you can run disk utility to repair permissions or repair the startup drive.
Have you changed the RAM recently? I recommend you reset the PRAM/SMC just to see if it changes anything. Also, repair disk permissions and verify your startup disk in disk utility.
Reset the SMC by shutting down, taking out the battery, and holding down the power button for 5 seconds. Next, put it all back in and hold down command-option-p-r until it chimes twice at startup.

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