After I left the gym this afternoon I was sitting in my car checking out something on my phone. I had the radio on. Then I turned the radio off and took out my key. When I tried to switch the radio back on it came up with "CODE" on the display. I thought, "oh I don't think I have the code I'll sort it out when I get home" and turned the radio off again.
It didn't fully turn off though, and now the date and time display and the little orange lights behind the dials on the radio are on all the time. Even after taking the key out and leaving my car. None of the buttons will do anything. I tried holding AS and pressing the power button as I read that somewhere but nothing has worked.
My main concern is that it's been on all day now, and that it might drain my battery overnight. Does anyone know of any way to get the radio to turn off properly, or turn back on? It's a CDR 500.
If no-one can help me get it working again, will disconnecting the battery and reconnecting it at least turn it off fully so it won't drain my battery?