MBP won't detect 20" Cinema Display

I am trying to connect my two-year old 20" Cinema Display to a last gen MacBook Pro 15". When I plug in the power to the monitor and the DVI cord, the white indicator light on the monitor is on and stays on - as if power is consistently being fed to the display.
Yet the MBP will not detect the display no matter what I do. I've tried restart and plugging everything in again. System preferences does not offer much past detect displays... which doesn't work.
What do I do to get this to work?

I have an old ADC Cinema Display which has been working fine with my new MBP 17" until I fired it up one morning and no display. There were no new software installs, etc. since lthe night when it worked and the morning when it didn't. The display and ADC/DVI adapter work fine on my tower so it's not the CD or cable. And another monitor works fine on the MBP so it's not the video card or the DVI jack. Also the USB functions on the back of the CD still work with the MBP and there is power - just no PIX. I've plugged and unplugged everything - power cycled - no results. Tried another MBP and no display. Still it powers the tower. Any ideas would be most appreciated.
Thanks!

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I have an old ADC Cinema Display which has been working fine with my new MBP 17" until I fired it up one morning and no display. There were no new software installs, etc. since lthe night when it worked and the morning when it didn't. The display and ADC/DVI adapter work fine on my tower so it's not the CD or cable. And another monitor works fine on the MBP so it's not the video card or the DVI jack. Also the USB functions on the back of the CD still work with the MBP and there is power - just no PIX. I've plugged and unplugged everything - power cycled - no results. Tried another MBP and no display. Still it powers the tower. Any ideas would be most appreciated.
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Webb
Message was edited by: Jo Ann+Webb

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^_^

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<http://tbn1.google.com/images?q=tbn:YpgpqSJmIIBI1M:http://upload.wikimedia.org/wikipedia/commons/0/09/AppleDisplayConnector.jpg>
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MBP won't detect 20" Cinema Display

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