radio failure

We have a 2013 Honda Insight. For the past couple years we've had a problem with the radio. Some times it works and other times it doesn't The radio display always works... just no sound. We've replaced both the radio fuse and the backup fuse but that didn't help. Any ideas?

While the car was turned off, connected the jumper cables to the donor car as it was running in reverse poles. There were sparks and without starting the insight, checked the battery, put the poles correctly and started the car. Now the IMA system warning is on and the hybrid system is not...