Black screen on 24" LED Cinema Display using Mac Pro

Hi,
I need some help guys.
I was messing about with my screen resolution and I selected the 720p setting.
Since doing so, my screen is blank and I am unable reset it.
I have tried resetting the PRAM (holding Command, Option, P and R keys) and release after the 2nd start up chime. The screen fires up whilst the system boots up, goes blank again and then for a split second or so fires up (light blue screen) and returns back to a blank screen. I have tried this several times.
I have this new screen connected to my Mac Pro using the Dr Bott Video Link box as my Mac Pro does not have the mini display port.
Any assistance would be appreciated.

Hi Malcolm,
I am glad to report your 2nd suggestion worked a treat and I have a display that works
Thanks for you help - Much appreciated.

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frankiko wrote:
Thank you for your quick response.
You're welcome, frankiko
Is it true that in your opinion it should work?
No.
I will try your suggestions ... send back the LED cinema display... it seems to be working with MacOS.
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Black screen on 24" LED Cinema Display using Mac Pro

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