Using the IMac 27 only as display for MacBook Pro

i like to use my iMac 27 only as display for my MacBook Pro.
I have the connecting cable.
I must start the iMac, he is booting and then i can plug in the cable to my MacBook. Now i have the second display for using with my MacBook.
Now my question: Is it possible to use the display without booting the iMac-system?
Thank you for help!
Best wishes

LutzTrabert wrote:
Now my question: Is it possible to use the display without booting the iMac-system?
[_*Using a 27-inch iMac as an external display*_|]

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