2003 Accord EX radio/clock problem

Hello-

We just installed a headlight and since then the radio and clock are not functioning. All the clock does is flash the wrong time. The radio does not turn on, nor does the CD player work. We tried setting the time by holding down the "sound" button as it says in the instruction manuel, but the clock keeps flashing and it doesn't do anything. Any idea how to fix this?

Is the radio asking for a "Code"?

If so, you'll need to plug in the code off of the Anti-Theft Device card provided when the car was purchased....no idea how to recover it if you don't have it.