what could cause the power seats, windows, and door lock not to work?

Did you see which fuse to check for sure? Did you refer to owners manual for fuse location and function? Sure sounds like a fuse or fuseable link problem! Suggest checking ALL fuses with a test light, each side of each fuse should light up the test lamp!! (Key on) Check maxi (big) fuses also. Now it is possible the ignition switch electrical part has seperated enough to loose power to this circuit. Possible!