Convert your 2009/2010 27" iMac into a large screen display for another computer
Passive video cable for digital monitors with mini DisplayPort, ideal for using the 27" iMac (2009 or 2010) as a display or LCD-TV on Macs with mini DisplayPort or Thunderbolt video output.
This cable will also serve as a video cable to attach many 3rd party displays with mini DisplayPort to a Mac with Thunderbolt 1, Thunderbolt 2 or mini DisplayPort.
Caveat: This does not work with Thunderbolt 3, Thunderbolt 4 or Thunderbolt 5 connectors and there are no such adapters to our knowledge.