radio/cd code

hi ive a k12 1.0 & recently had battery disconected, its not the 1st time (ive had the car several yrs) ive entered the radio code which i know to be 100% correct & pressed ta/enter button but nothing happens, ive never had this problem before.
radios all lit up & code goes on as it should but thats it? it just stays like it despite pressing enter if i switch ignition on/off & turn radio on itl come up with the correct digits still but still wont react when i press enter - anyone come across this before?
thanks in advance
 
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