Since not everybody has seen the Mac Mini connectors before, they are removed most easily by lifting up on the wire-end of the connector. Use care as it is very easy to break the plastic that retains the pins in the connectors. Using something soft and thin, like the end of a plastic wire tie to lift the connector is safest. Do not pry against the motherboard. Not much lifting force is required to remove the connectors, but done incorrectly, the connectors can be damaged fairly easily.