Recently purchased a 2012 Prius five in need of new head gasket. Repair completed, but when I hooked up the 12v battery afterwards it was completely dead. Bought a new 12v, but now my nav screen is blank. Buttons all beep when they are pressed, and I can hear static from radio and blindly tune to find a channel. So the unit seems to be functioning besides the blank screen. It worked after I purchased the vehicle, and only stopped after unhooking and experiencing the dead battery. Am I missing something? Have only taken two 20-30m trips since replacing battery.
