Try unhooking the battery again but this time wait a few minutes. once you reconnect the battery cables, the security system will count down and ask for your code. Hopefully this resets the system.
NOTE: Make sure you have the 4 digit security code.
My radio did something similar sometime back (not turn on - didn't have the on problem when the car was off though). It might be a low/faulty battery that could cause the system to act up.
Good luck.
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