Trying to use my 2013 27" iMac (10.14) as an external display in target display mode with my 2013 macbook air (10.11.6) and an apple TB1 cable. After using command f2 (as instructed per apple site), my MBA thinks there is an external display connected. I know this because there are more controls available in system preferences like mirror mode, adjacent display, etc. Also, my MBA LCD screen resolution will change when I switch to mirror mode. But my iMac screen is black. It is either not showing an image OR it is so dark (can't tell if there is maybe 1% luminosity or not) it is unusable.
My only thoughts are maybe my Apple TB cable is broken or it's a MacOS vs OSX compatibility issue.
any thoughts?
My only thoughts are maybe my Apple TB cable is broken or it's a MacOS vs OSX compatibility issue.
any thoughts?
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