My Prius seems to be a noisy one and I am wondering if all this is normal, or if i should get it looked at before something melts down. #1 On start up (seemingly in cold weather) i hear a lot of clicking noises coming from what seems to be behind the dash just before the engine starts up (and for a second or two after). I do not believe I heard these noises until a few weeks ago when the temps started dropping. #2 Inverter hum / whine. I seem to get this when accellerating when using EV mode or when braking. I hear a distinctive high pitched (almost ultra sonic) noise coming from behind the dash area. #3 Mirror shake and noise. This is an obvious one. My mirror makes a bunch of noise, like the two parts are loose. I'm going to see about getting it tightened up or replaced. Let me know if you have experienced similar problems. Its a 04 Prius.