ACD Monitor / DVI Adapter not Displaying

I just purchased an ATI Radeon 9800 Pro Mac Edition and installed it in my Quicksilver as the original card stopped working (lotsa noises coupled with no display on ACD or DVI monitor). I also purchased Apple's DVI to ADC adapter to connect it to my Apple LCD monitor.
After installing the card and hooking up the adapter, the monitor's white power button comes on, but there's only a black screen. I've hooked up another DVI monitor to the Quicksilver and can confirm the new video card is working. I've tried using the ACD monitor with the adapter on a PowerBook, and the laptop recognizes there's a second monitor, but there is still the black screen. If I push the power button on the monitor while connected to the laptop, then disconnect the monitor, the "Do you want to shut down your computer?" dialog box has popped up on the laptop's screen, so it would seem that there's at least communication between the computer and monitor. Unfortunately, I don't have any other ADC compatible computers to test the monitor independently, but have had no problems with it prior to the old video card going bad.
Could the adapter or monitor be bad, or is there something else that could be interfering with the operation?

(dual running the DVI adapted ADC and a VGA (as main) right now)
No luck with the reset. I got a garbled screen in place of the Apple loading screen, but then it started up fine. Still displays on the VGA, but black on the ADC monitor. Apple System Profiler shows this under Graphics/Displays if it is of any help:
ATI Radeon 9800 Pro:
† Chipset Model: ATY,R350
† Type: Display
† Bus: AGP
† Slot: SLOT-1
† VRAM (Total): 256 MB
† Vendor: ATI (0x1002)
† Device ID: 0x4e48
† Revision ID: 0x0000
† ROM Revision: 113-A07525-130
† Displays:
Apple Studio Display:
† Display Type: LCD
† Resolution: 1280 x 1024
† Depth: 32-bit Color
† Core Image: Supported
† Mirror: Off
† Online: Yes
† Quartz Extreme: Supported
Apple Studio Display:
† Display Type: CRT
† Resolution: 1024 x 768 @ 60 Hz
† Depth: 32-bit Color
† Core Image: Supported
† Main Display: Yes
† Mirror: Off
† Online: Yes
† Quartz Extreme: Supported

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I have both a 2008 Mac Pro tower with 2 Apple Cinema Displays, and a newer MacBook Pro that I'd like to hook up to one of the monitors.
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I did see quite a bit of the same issue online, thought I couldn't find any help in fixing it.... short of driving back to the apple store and replacing the adapter, I'm wondering if there's anything else I should do to trouble shoot this....
I've restarted the computer, checked all connections, nada....
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The problem was simple: my laptop wasn't plugged in...
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ACD Monitor / DVI Adapter not Displaying

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