I don't understand:
ALL of which were connected to the OLD thermostat before I decided to replace it except the yellow.
Is the wire replaced or the stat?
Is the yellow wire connected to the stat or not?
A wire, usually yellow, is connected to the Y terminal, and along with a white wire, picked up at the furnace, goes out the compressor , as a two wire cable, (red &white), and closes a relay, which must be pulled in to start the compressor motor.
Your new stat may very well use different terminals and may not match the old.
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