apple cinema display sleeping issue

I have a 20" apple widescreen cinema display. it is a few years old and has the plastic frame with an adc connection and 2x usb 1 ports on he rear. there are 2 touch buttons on the front. if i press the power button on the monitor, the whole computer sleeps not just the monitor. How can i make it so only the monitor switches off. Is there some way to save the power this monitor uses? the computer is powerm dual g5 with 64mb gf5200 ultra. using tiger 10.8 (eagerly awaiting leopard)
PowerhousecomputingAsked:
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rslyCommented:
http://www.tuaw.com/2007/08/02/tuaw-tip-turn-off-your-cinema-display-without-putting-your-mac/

I believe this is what you're looking for, except it looks like having this option is entirely dependent on the monitor you have. I see in your comment that it appears you already know of this because of your newer monitor. It looks like you're also correct that this is something that Apple would need to address directly as having that option is entirely dependent on the type of monitor you have, and is only supported on newer Apple cinema displays.
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rslyCommented:
Check your System Preferences->Energy Saver. Then, under Options, check the Other Options section and see if "Allow power button to sleep the computer" is checked. If it is, uncheck it.

Your best option for saving power on the monitor is to set the Sleep options in Energy Saver to be shorter periods of time. The second timeline controls your monitor, so there's where you can control how long it is before your monitor sleeps.

Hope that helps.
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PowerhousecomputingAuthor Commented:
I did this, so now when i touch the button it just glows brighter but doesn't do anything. Also i would prefer not to adjust the screensaver settings, because i have dual monitors. (the other is the new silver screen - which gives me the option in system pref to use its power button only for the monitor.) since apple haven't addressed this issue themselves I'm worried it cant be fixed at all.
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rslyCommented:
One last thing you could try is to make sure that the monitor in question is connected via USB cable to the desktop. Without the USB connection, OS X can't sense the monitor type and you definitely won't have the option since the monitor is a USB monitor HID device and that's how the info is transmitted. I don't know if this will help with the older monitor, but if you're not already set up that way it's something you could try.
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PowerhousecomputingAuthor Commented:
The monitor uses and ADC connection. This combines power, video and usb into 1 cable from the graphics card. The only thing i have found which may help is an ADC to DVI adapter which seperates all the Video Signal, USB and Power. Apple sell this for £70 direct. This seems like a lot to pay for what it is but Apple insist it is a very complex and sophisticated piece of equipment. Also apple couldnt verify if it will do what i want. Can anyone here?
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