27" Cinema display goes black, connected to Mid 2011 iMac w/thunderbolt connections.

I bought a used 27" Cinema Display (A1316) and had it connected to my Mid 2011 iMac with thunderbolt connections.  The screen goes black but I can still get audio through its speakers.  Do I need to replace the cable bundle?  Help please!
Levi

Hi levifromhenderson,
Thanks for using Apple Support Communities. Based on what you stated, it sounds like trouble with an external display. I would recommend that you read this article, it may be able to help the issue.
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Reset the system
You can reset the Mac's parameter RAM and SMC.
Cheers,
Mario

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