Loss of Image Info on Cinema Display

I recently jumped to a 2 year old G5 and 20" cinema display combo and am getting screwed.
Basically, my screen is not showing me what's actually going on with the files. The screen seems too contrasty / punchy / hot... I'm a graphic designer, and since I need to be able to (at least marginally) view on screen what information is in a file, this has made image manipulation nearly IMPOSSIBLE. My epson printouts DO show me this "lost" information, but I certainly can't work off of printouts alone for the life of this machine.... In the meantime, areas of an image that are as dark as 10 or 20% grey are showing up on screen as PURE WHITE. And this is probably only the loss that glaring enough for me to notice... (Although, when I watched a movie the other day, the blacks also felt WAY too dense, and seemed to eat many of the scenes...)
I've tried every calibration option the ACD seems to offer, to no avail. I've checked to make sure my video card works with my monitor, as answered in the affirmative with the following thread:
http://discussions.apple.com/thread.jspa?threadID=1125196&tstart=0
At this point I don't know if the problem is in my G5, or the monitor, or what....
Can anyone help?
Some more information that may be helpful/relevant:
1) The "hotness" is not application specific. It occurs in Photoshop, Quark, in PDFs, everywhere....
2) The G5 was refurbished when originally purchased.
3) Before I jumped to this set-up a few weeks ago, I was on a very reliable emac running OS9 (no snickering please...) and what I saw on the screen there was pretty bang-on with what I was seeing in my print outs and final files.
4) I'm using the same printer and scanning devises that I was with my emac, so I don't think they're the problem... but JIC, they are Epson Perfection 1640SU Scanner, and Epson Stylus photo 1270 Photo Printer.
Let me know If I've left out any key, relevant info.... And Thanks!

Make sure the "Enhance contrast" slider in the "Seeing" tab of "Universal Access" system preference is all the way to the left.

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If your laptop has a CardBus slot you can use it with a VTBook
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Revision ID: 0x0000
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Display Type: LCD
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Hello,
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Message was edited by: the princess consort

Go into System Preferences/Universal Access and, under the Seeing tab, check that the Contrast slider is all the way to the left (Normal).

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Message was edited by: Jonathan_R

Hi,
An Interesting one.
I am not sure there are any setting on the Mac to change this.
System Profiler is not "Dragable" to re-order the USB list.
Although it may be possible to use Terminal to re-order any list or priority that would be beyond my knowledge.
I would tend to go for the work around of using Photo Booth or iChat to make the unwanted camera Busy.
8:18 PM Monday; April 12, 2010
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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I talked to Applecare multiple times and they came up with zero solutions, but I found a fix myself. If you go into MSCONFIG, while in Windows 7, and turn off bootcamp services from starting at the launch of Windows 7 it doesn't dim the screen and everything works completely fine. I'm making this post to show people how to easily fix this problem and so Apple can fix whatever is making the bootcamp services dim the brightness of the cinema displays.
The problem is indeed 100% caused by the bootcamp services. If I start the computer without bootcamp services running there are no brightness issues. As soon as you open bootcamp services it instantly dims the screen and have to go back to MacOSX to fix the brightness.
Anyone have a clue why bootcamp services wouild do such a thing?
Thanks for your time, I hope this helps some people and I really hope apple looks into this problem.
P.S. Please discuss this topic and add any other ideas on hotfixing this problem.
ADDITIONAL INFO: I am using Windows 7 Professional 64x.

I traced the problem to hardware - I'm running an older Apple ADC 23" Digital Cinema display, so use and ADC to DVI adapter - because of this there is a USB "pigtail" which carries the USB from the rear ports on the monitor into the PC. This works fine in MacOS, but boot into Windows (and I tried XP running NOT in BootCamp and Windows 7 running IN BootCamp) and it seems to hunt and search for this "generic hub" (the USBs in the monitor) and upon not finding them appears to send some kind of signal to that hub, disengaging it or whatever, and dimming the screen. In Windows XP this happens right after the login screen appears, but in Windows 7 it won't happen until AFTER you log in (always thinking "Gee! Maybe this.... time.... ah.... ^%$#@!").
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Loss of Image Info on Cinema Display

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