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Aug 1, 2015 3:28 AM in response to Grendeloakby woodmeister50,iMacs from mid 2011 to now will only work in target display mode
with a Thunderbolt port equipped Mac. Nothing else will work.
Late 2009 and 2010 iMacs will work with Macs equipped with
Thunderbolt ports and Macs and perhaps other devices equipped
with Mini Display Port.
Early 2009 iMacs and earlier do not support Target Display mode.
See this page Use your iMac as a display with Target Display Mode - Apple Support.
Here is the table from that page for Target Display mode connectivity:
iMacs you can use
as a displayCable
you needPort you need
on your other MaciMac (27-inch Late 2009)
Mini DisplayPort to Mini DisplayPort
Mini DisplayPort or Thunderbolt iMac (27-inch Mid 2010)
Mini DisplayPort to Mini DisplayPort
Mini DisplayPort or Thunderbolt iMac (Mid 2011)
Thunderbolt
Thunderbolt iMac (Mid 2012 and later) Thunderbolt Thunderbolt