My trusty 1997 Toyota Camry needed a new battery. I took it to Wal-mart & had them install a new battery, the radio worked fine before it now it won't work. It lights up when the headlights are on but the display just reads SEC for the security code. I can't turn it on or anything. Another issue, silly me set a Security Code & I can't remember it. Any idea on how to get the radio working again? These hour long commutes to and from work are so boring with out the radio. Thanks for any advice!!