HT2811 Cinema Displays 27", blank screen and doesn't come on.

I have two Cinema Displays 27" on a Mac Pro, one display powers up and works fine, the other stays blank with the light blinking three times. Short, Long, Short, meaning my power adaptor is wrong, but switching adaptors doesn't work.
I have read the Apple article about the monitor things it's using the wrong adaptor. But mine I've been using is the correct one for the size and it even works when I switch adaptors and leads with my working display.
Not sure how to fix this. I've tried unplugging everything, and plugging one thing in at a time and restarting to try and isolate any problems.
Any suggestions?

Hi Rocky Rakoon,
Thank you for your post, and welcome to the Apple Support Communities.
I understand that your Apple Cinema Display is not turning on upon startup. I'd like to reset the following, as it may resolve your issue:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
You may also want to reset your computer's PRAM:
OS X Mountain Lion: Reset your computer’s PRAM
http://support.apple.com/kb/PH11243
Note: Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.
For more troubleshooting directly related to the Cinema Display, see this resource:
Apple Cinema Display: Troubleshooting steps
http://support.apple.com/kb/HT2810
Thanks,
Matt M.

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