Other posts have discussed the fact that the radio comes on when the car is started, even if it is off when the car is shut down. Some people find it annoying.
Paypal me $50 and I can make it stop.

Like magic.
Okay, just disconnect the battery. I'd try giving it a half hour.
I'm gutting my car for sound deadening (I'll post when it's done) and have had the battery out for several days. Last night I reinstalled the seats and battery. As soon as I reconnected the cables, I heard clicking behind the dash (maybe a relay re-energizing; my Mini does the same thing), and then the radio came on. I shut it off, and then back on without the key in the car. When I started the car, the radio did not come on. The station presets were still set, but the tone controls went to a default setting-bass and treble went to 0, and the loudness circuit went to the on position.
Hope it works for you.
