Stereo Issue

I have a 00 sunfire that i just got back from Dealer. The computer was replaced and now the stereo won't turn off when ignition is turned off i need to press the power off button on head unit (even after the door is opened). Any ideas if this is b/c the computer wasn't properly programed? The car's going back to dealer on monday b/c the CEL is on, apparently the tech forgot to program the crank sensor.