Powering up from Cinema display

Hi all,
Ive checked other posts about this and it seems it is possible for me to power up the whole Mac using the cinema buttons on the side. However in my system display preference it only gives me the option of:
-power up (just) the display
-putting the system to sleep
and - do nothing.
Theres nothing there that gives me the option to turn my WHOLE system ON/OFF. Is there anywhere else I should look at? My cpu is positioned under the table because Im a bit short of space so its always a hassle to powerup the machine.
Thanks a lot in advance.
Cheers

Computer power up from the display is no longer an option. This was made possible by the "old style" propritary ADC connector which has been replaced by a more standard DVI connector with USB and FW breakouts.
DD

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