I just cleaned my battery terminals and after i reconnected it and started my car the radio screen didn't turn on (aftermarket radio). The aux and the USB didn't work but there's a red light blinking on it, which I think is the security system light but I'm not sure because the stereo was in there before I bought the car. All the fuses are good and the connections seem to be fine, it worked before I disconnected the battery so I think it has something to do with the security system but I'm not sure, any advice would be appreciated.