Where's my "Power On" function?

I just hooked up my Apple ADC/DVI adapter to link my 20" Cinema Display to my MacPro, and the "Power" glowing button just permanently glows now. I can't turn on my computer using this button anymore like I could with my G4. Is this right? I have checked prefs and options within prefs, and the settings seem right, but I have to use the computer switch to turn the unit on now, and that's a lot mor awkward. Given the size of the unit, surly they haven't taken this convenient function out.

The adapter disables the power button on the display. Has something to do with a limitation of the DVI connector. It doesn't have a pin for the power. It's normal.
MacBook Pro 2.16GHz   Mac OS X (10.4.8)  

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