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Yep, didn't mark wires before disconnecting from old thermostat. Blue wire to B, Orange to O, and so on and so forth doesn't work...nothing happens. I saw somewhere where you should be able to figure it out by looking at the wires on the furnace but that confused me more...2 white wires, a red and yellow attached to Y, for example. Picture of wires to furnace and new thermostat posted. Please help!