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Cannot enter target display mode on macOS

williamcll
By williamcll
in Troubleshooting
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Model: iMac 21.5 mid 2011

os: macOS High Sierra

Keyboard: Lenovo USB netvista full width keyboard

Mouse: apple TouchPad. 

I've tried the following solutions online:

1keyboard: I don't have a Bluetooth keyboard, using an android phone to act as a keyboard just result in repeated disconnects. 

Virtualkvm: the program starts but nothing happens. 

Karabiner-elements: online tutorials uses an older UI which looks different to the current version. Setting function keys to F1, F2 ends with me receiving the alert sound when I hit cmd+F2 on the login screen. 

I can confirm the thunderbolt 2 to HDMI port works because it can output video to another monitor. 

Terminal: nothing. 

Specs: Motherboard: Asus X470-PLUS TUF gaming (Yes I know it's poor but I wasn't informed) RAM: Corsair VENGEANCE® LPX DDR4 3200Mhz CL16-18-18-36 2x8GB

            CPU: Ryzen 9 5900X          Case: Antec P8     PSU: Corsair RM850x                        Cooler: Antec K240 with two Noctura Industrial PPC 3000 PWM

            Drives: Samsung 970 EVO plus 250GB, Micron 1100 2TB, Seagate ST4000DM000/1F2168 GPU: EVGA RTX 2080 ti Black edition

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https://linustechtips.com/topic/1180510-cannot-enter-target-display-mode-on-macos/
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