So I got my car back 2 days ago and for some odd reason the radio will not turn on. I checked all the fuses and wires and everything seems fine. I've held down the power button multiple times and tried resetting it... still nothing. My headunit is a Boss Audio 642CA (http://www.onlinecarstereo.com/CarAudio/p_28588_Boss_Audio_642CA.aspx). Now on to the catch... Recently my battery has been dying if I let the car sit for 2-3 days without turning it on. I just came to realize that when I turn the car off, the headunit turns on (I hear it looking for the CD inside). It does this continually. I'm assuming that this is what's draining my battery. Why is it that the radio is on (I assume) when the car is off and vise-versa.? Any ideas?