2002 honda accord codes for radio?

This question was asked by another user but I have the exact same problem: --I recently replaced my battery and immediately after that I had stereo problems. The LED on the stereo says there is an error and also my alarm light is blinking in the upper left-hand corner of the stereo. I'm not sure...

I want to have my 2002 honda acoord radio cade

My daughter left the radio playing with the car turned off and ran down the battery. It jumped ok, took a charge and runs fine. However the radio will not operate at all, it won't even turn on. How do I get it working again?