Can I use an iMac 27 "mid-2011 in target Display Mode broken graphics card?

I inherited the iMac, and rather than buying a new graphics card, want to use it as a second monitor on my MacBook Pro, with thunderbolt. I tried to connect the iMac and MBP with a thunderbolt cable, but F2 command is not turn on/off the iMac in display mode. I'm doing something wrong?

I think that you need the graphics card to be able to use the TDM. You must also use a good video cable Thunderbolt such as those used with your other view.

Tags: Mac

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