Hi all

I have a work pc with thunderbolt 3 ports which I can use to drive a LG 
UltraFine 5K Display

https://www.apple.com/au/shop/product/HMUB2X/A/lg-ultrafine-5k-display?fnode=5cbba005c212c0bd4a1b3508e7106d2e7030cb026fedd6b867046cfb3c547747f408e67eabf4a925575044e70e50c3bf75005783464b9081deb466c68b00b22cda0a0852fa6035ba11d52d0885e24f4eb4f8123c9b47b49f874d99900325fdb2afe64e9cc82cb523b8449b1012e1d58c
 
<https://www.apple.com/au/shop/product/HMUB2X/A/lg-ultrafine-5k-display?fnode=5cbba005c212c0bd4a1b3508e7106d2e7030cb026fedd6b867046cfb3c547747f408e67eabf4a925575044e70e50c3bf75005783464b9081deb466c68b00b22cda0a0852fa6035ba11d52d0885e24f4eb4f8123c9b47b49f874d99900325fdb2afe64e9cc82cb523b8449b1012e1d58c>

But the display is not always available to me and so I thought I would try 
running my late 2013 iMac running MacOS Catalina as a monitor as per:

https://www.techjunkie.com/how-to-use-an-imac-as-a-monitor-for-pc/ 
<https://www.techjunkie.com/how-to-use-an-imac-as-a-monitor-for-pc/>

I have the:

Thunderbolt 2 cable; and 
Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter, 


https://www.apple.com/au/shop/product/MMEL2AM/A/thunderbolt-3-usb-c-to-thunderbolt-2-adapter?fnode=758957dba5e4e005989a835a436e7642c8374943a0d49264649ec078faf37eb3c552500b4e0d15c5a7cefb7a261fe8144b966a37067f3582f7487ed359e1a8a0287ee35e593d6e1d6850dcc5c31104377132a9be3b7e4b835fd6c487f245bc7374591088408930968a504afe03ad9f91
 

and followed the instructions of holding command-F2 (or command-option F2) at 
startup on the iMac using its original keyboard, but it doesn’t work.

I thought I would give it a go, but before I give up, has anyone else tried 
this with any success?

Thanks

Adam
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