TS4080 Try to use iMac with Thunderbolt cable as a display and it goes black

For work I have a MacBook Pro 15" Late 2011. I connected a Thunderbolt cable to both the MacBook Pro and iMac. When I press Command F2 to use the iMac as my main screen, the iMac just goes dark. No screen at all. I can only get out of using Command F2.
What am I missing. How can I used my iMac as external display for my MacBook Pro.
Thanks.

All firmware current on that late 2011 MacBook Pro? This EFI firmware update addresses Thunderbolt target display mode, and other issues.

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