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My mac makes a sound and doesn't do anything when I press command-f2 even when the cable is connected.
iMac Line (2012 and Later)
No idea what Mac you have or which Mac you are using as the target display.
See: Use your iMac as a display with Target Display Mode - Apple Support
No idea what Mac you have or which Mac you are using as the target display.
See: Use your iMac as a display with Target Display Mode - Apple Support
it's a Imac 21.5 inch, late 2013
and im using this cable: https://www.amazon.com/AmazonBasics-Mini-DisplayPort-HDMI-Cable/dp/B0134V3KIA
Nowhere on the page I linked does it say you can use an HDMI cable.
target display mode doesn't work
