24" Cinema display is flickering every 30 seconds or so. Has anyone found a solution?

I have a 2009 Power Mac tower with a 24" cinema display also 2009. About a year ago the display started flickering, like it was turning on and off. I've got a duel display set up and the other one (older acrylic 20") works fine. I've checked the cords, updated to the latest soft wear, at least I think I have. I see others having the same issue. Has anyone found a solution? This is really annoying when trying to do graphics work. Any help would be much appreciated

Hi 517 Design, 
Thanks for visiting Apple Support Communities. 
If you are seeing flickering on your Cinema Display, you can find many additional troubleshooting tips in this guide that can be helpful:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Best Regards,
Jeremy

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