Radio stopped working

My son was watching my other son in the car while I was shopping. It appears that he did not place the car on the proper key setting. When I got back to the car I had a ton of lights on.

It said my door sensor was not working, the oils pressure sensor was not working, the light sensor was not working. Additionally, it showed that the high beams were on, even though they were not, and the sound for the turn signals did not come through. Finally, the radio would not work.

My assumption was that the battery almost drained and it needed to be powered up. After driving it a few hours home everything but the radio was back to normal, the radio would not come on.

I drove it later that evening, and while driving the radio came on and worked the rest of the night. However, the next day it no longer worked. I checked the three fuses that appear to control the radio, and they all seem to work.

One last thing, a penny ended up in the CD changer.

Any help would be awesome!