I have the requisite model iMac -Late 2009 iMac, and a brand new PC build employing AMD Threadripper and a GTX1080. I would like to use the iMac as a display in target disk mode from the PC/
The GTX1080 outputs to three DP's(DisplayPorts) and an HDMI. I have tried TDM using a DP to MDP(MiniDisplayPort) cable but have not succeeded in getting past the floating Firewire logo that TDM shows on this iMac build.
I see on Apple's forums it is specifically mentioned that MDP to MDP cable is to be used, and yet, I can find no evidence on the web to suggest that there's any actual difference in the data transmission between DP & MDP.
Is this configuration supported?