iMac 27” mid 2011 target display mode not working
I am tearing my hair out trying to get my old iMac (27" mid 2011, High Sierra 10.13.6) to use as an external monitor with target display mode on my old MacBook Pro (13" 2012, Catalina 10.15.7). I'm using thunderbolt 2 cable to connect them. I've followed all the steps here Use your iMac as a display with target display mode – Apple Support (AU) and nothing happened. iMac won't display MacBook Pro. I’m using the original keyboard that came with the iMac and Apple thunderbolt 2 cable. Can't figure out why. Need help!!!
iMac 27″, macOS 10.13