iMac as 2nd screen for MBP retina

I am trying to establish and to use my old iMac (2011) (OS 10.10.5) as a second screen to my most recent of the retina MBP (OS 10.11.4) by following these guidelines, but they do not seem to work:

Follow these steps to start to use your iMac as a display:

Make sure that both computers are turned on.

Connect the Mini DisplayPort cable or love at first sight between the two computers.

Press command + F2 on the keyboard of the iMac, you want to use as a screen.

When you press Control-F2, your iMac displays the connected Mac Office.

These directions seem very simple and I followed their exactly so I do not understand what I could possibly hurt. Is there a problem with them?

specify:

I use a thunder cable adapter to connect with the Firewire cable. It would make a difference?

Tags: Notebooks

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