I connected the colors that is inside the brown wire that connects to my AC Unit outdoors but it still don't work and I don't have any power going to my thermostat. Please help!

If you didn`t kill the power to the furnace, you prob. Either blew a low voltage fuse in circuit board or fried the transformer,, this is only a guess sense we have no idea what you was doing connecting the colored wires or even why

This question should have been tagged to the 1st question, instead of a completely different had no idea what you was talking about before reading on to the next question/ comment